{"id":290858,"date":"2025-10-21T12:48:20","date_gmt":"2025-10-21T11:48:20","guid":{"rendered":"https:\/\/tpmatrix.co.uk\/?post_type=project&#038;p=290858"},"modified":"2026-07-31T09:27:31","modified_gmt":"2026-07-31T08:27:31","slug":"amelioration-de-la-fiabilite-du-boitier-suh-sur-la-flotte-de-classe-390","status":"publish","type":"project","link":"https:\/\/tpmatrix.co.uk\/fr\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/","title":{"rendered":"Am\u00e9lioration de la fiabilit\u00e9 du bo\u00eetier SUH sur la flotte des Class 390"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; custom_padding_last_edited=&#8221;on|tablet&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; use_background_color_gradient=&#8221;on&#8221; background_color_gradient_direction=&#8221;90deg&#8221; background_color_gradient_stops=&#8221;rgba(31,37,50,0.82) 0%|rgba(31,37,50,0.11) 100%&#8221; background_color_gradient_overlays_image=&#8221;on&#8221; 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locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h4>Project Summary<\/h4>\n<p>[\/et_pb_text][et_pb_text content_tablet=&#8221;&#8221; content_phone=&#8221;&#8221; content_last_edited=&#8221;on|phone&#8221; admin_label=&#8221;Title&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_2_text_align=&#8221;left&#8221; header_2_text_color=&#8221;#1F2532&#8243; header_2_font_size=&#8221;36px&#8221; header_2_line_height=&#8221;1.2em&#8221; width=&#8221;100%&#8221; height=&#8221;1px&#8221; max_height=&#8221;1px&#8221; custom_margin=&#8221;0px||10px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; header_2_font_size_tablet=&#8221;34px&#8221; header_2_font_size_phone=&#8221;30px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_text][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb flex-about&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_main_element=&#8221;flex-grow: 1;||padding: 10px;||align-items: center;||flex-basis: 33%&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"color: #1f2532;\"><strong>Repaired and tested 60+ Class 390 SUH Boxes<\/strong><\/span> &#8211; helping Alstom replenish float stock and reduce fleet downtime.<\/p>\n<p>[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb flex-about&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_main_element=&#8221;flex-grow: 1;||padding: 10px;||align-items: center;||flex-basis: 33%&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"color: #1f2532;\"><strong>Identified and resolved key failure causes<\/strong><\/span> &#8211; including water ingress and ageing network resistors affecting unit reliability.<\/p>\n<p>[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb flex-about&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_main_element=&#8221;flex-grow: 1;||padding: 10px;||align-items: center;||flex-basis: 33%&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"color: #1f2532;\"><strong>Reduced repair lead times and improved fleet availability<\/strong><\/span> &#8211; through a comprehensive repair and functional testing programme.<\/p>\n<p>[\/et_pb_blurb][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=&#8221;3_5,2_5&#8243; make_equal=&#8221;on&#8221; custom_padding_last_edited=&#8221;on|phone&#8221; admin_label=&#8221;Client Challenge&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#F4F4F4&#8243; width=&#8221;90%&#8221; width_tablet=&#8221;90%&#8221; width_phone=&#8221;90%&#8221; width_last_edited=&#8221;on|phone&#8221; max_width=&#8221;1296px&#8221; max_width_tablet=&#8221;1296px&#8221; max_width_phone=&#8221;1296px&#8221; max_width_last_edited=&#8221;on|phone&#8221; custom_margin=&#8221;||80px||false|false&#8221; custom_margin_tablet=&#8221;||60px||false|false&#8221; custom_margin_phone=&#8221;||40px||false|false&#8221; custom_margin_last_edited=&#8221;on|phone&#8221; custom_padding=&#8221;40px|40px|40px|40px|true|true&#8221; custom_padding_tablet=&#8221;40px|40px|40px|40px|true|true&#8221; custom_padding_phone=&#8221;20px|20px|20px|20px|true|true&#8221; hover_enabled=&#8221;0&#8243; border_radii=&#8221;on|8px|8px|8px|8px&#8221; collapsed=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;3_5&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; custom_css_main_element=&#8221;display: flex;||flex-direction: column;||justify-content: center;&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text content_tablet=&#8221;<\/p>\n<h2>Client challenges<\/h2>\n<p>&#8221; content_phone=&#8221;<\/p>\n<h2>Client challenges<\/h2>\n<p>&#8221; content_last_edited=&#8221;on|desktop&#8221; admin_label=&#8221;Title&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_2_text_align=&#8221;left&#8221; header_2_text_color=&#8221;#1F2532&#8243; header_2_font_size=&#8221;36px&#8221; header_2_line_height=&#8221;1.2em&#8221; custom_margin=&#8221;0px||15px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; header_2_font_size_tablet=&#8221;34px&#8221; header_2_font_size_phone=&#8221;30px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2>Client challenges<\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_font_size=&#8221;17px&#8221; link_text_color=&#8221;#00AF4D&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221; link_text_color__hover_enabled=&#8221;on|hover&#8221; link_text_color__hover=&#8221;#1F2532&#8243;]<\/p>\n<p>Alstom approached TP Matrix Ltd in January 2024 to explore support for their Class 390 SUH Box repairs. These units are critical to the fleet as the tilting system of the Class 390 vehicles is managed via sensors (gyros, accelerometers) on bogies, and a train-level \u201ctilt processor\u201d (TTP) that communicates with vehicle tilting processors (VTPs). Alstom faced prolonged lead times on repairs for the units. 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_module_preset=&#8221;default&#8221; max_width_tablet=&#8221;&#8221; max_width_phone=&#8221;&#8221; max_width_last_edited=&#8221;on|phone&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; sticky_position=&#8221;top&#8221; sticky_offset_top=&#8221;130px&#8221; sticky_limit_bottom=&#8221;row&#8221; sticky_position_tablet=&#8221;none&#8221; sticky_position_phone=&#8221;none&#8221; sticky_position_last_edited=&#8221;on|desktop&#8221; border_radii=&#8221;on|8px|8px|8px|8px&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column][et_pb_column type=&#8221;3_5&#8243; module_class=&#8221;pa-inline-buttons&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||10px|false|false&#8221; custom_padding_tablet=&#8221;70px|||0px|false|false&#8221; custom_padding_phone=&#8221;55px||||false|false&#8221; custom_padding_last_edited=&#8221;on|tablet&#8221; global_colors_info=&#8221;{}&#8221; custom_css_main_element_last_edited=&#8221;on|tablet&#8221; custom_css_main_element_tablet=&#8221;order: 1;&#8221; custom_css_main_element_phone=&#8221;order: 1;&#8221;][et_pb_text content_tablet=&#8221;<\/p>\n<h2>Investigation process<\/h2>\n<p>&#8221; content_phone=&#8221;<\/p>\n<h2>Investigation process<\/h2>\n<p>&#8221; content_last_edited=&#8221;on|phone&#8221; admin_label=&#8221;Title&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_2_text_align=&#8221;left&#8221; header_2_text_color=&#8221;#1F2532&#8243; header_2_font_size=&#8221;36px&#8221; header_2_line_height=&#8221;1.2em&#8221; custom_margin=&#8221;0px||15px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; header_2_font_size_tablet=&#8221;34px&#8221; header_2_font_size_phone=&#8221;30px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2>Investigation process<\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_font_size=&#8221;17px&#8221; link_text_color=&#8221;#00AF4D&#8221; custom_margin=&#8221;0px||41px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221; link_text_color__hover_enabled=&#8221;on|hover&#8221; link_text_color__hover=&#8221;#1F2532&#8243;]<\/p>\n<p>TP Matrix conducted an initial assessment and repair of a two SUH Boxes, followed by\u00a0<b>trials of the repaired units<\/b>. After a successful trial in\u00a0<b>October 2024<\/b>, we were asked to provide a formal proposal for\u00a0<b>full repair and functional testing<\/b>\u00a0of the units.<\/p>\n<p><span style=\"color: #1f2532; font-size: 18px;\"><strong>During the engineering assessment, two primary causes of failure were identified:<\/strong><\/span><\/p>\n<p>[\/et_pb_text][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf071;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><strong><span style=\"color: #1f2532;\">Water ingress<\/span><\/strong>\u00a0\u2013 Moisture entering through connectors, compromising the internal electronics.<\/p>\n<p>[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf071;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><span style=\"color: #1f2532;\"><b>Ageing network resistors<\/b>\u00a0<\/span>\u2013 Over time, resistor tolerances drifted, leading to intermittent or complete failures.<\/p>\n<p>[\/et_pb_blurb][et_pb_divider color=&#8221;#e8e5e8&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; max_height=&#8221;1px&#8221; custom_margin=&#8221;48px||44px||false|false&#8221; custom_margin_tablet=&#8221;58px||54px||false|false&#8221; custom_margin_phone=&#8221;32px||45px||false|false&#8221; custom_margin_last_edited=&#8221;off|desktop&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_divider][et_pb_text _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_text_color=&#8221;#1F2532&#8243; text_font_size=&#8221;18px&#8221; link_text_color=&#8221;#00AF4D&#8221; custom_margin=&#8221;0px||21px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221; link_text_color__hover_enabled=&#8221;on|hover&#8221; link_text_color__hover=&#8221;#1F2532&#8243;]<\/p>\n<p><strong>Our engineering solution included:<\/strong><\/p>\n<p>[\/et_pb_text][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Replacing <strong>all network resistors<\/strong> as standard to restore performance and tolerance.<\/p>\n<p>[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p><b>Replacing weakened connectors<\/b>\u00a0where water ingress had compromised the integrity.<\/p>\n<p>[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Carrying out any additional repairs required to return units to full functionality.<\/p>\n<p>[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||30px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Comprehensive\u00a0<b>testing on bespoke test equipment<\/b>\u00a0designed by TP Matrix to validate performance before returning units to service.<\/p>\n<p>[\/et_pb_blurb][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; custom_padding_last_edited=&#8221;off|phone&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#F4F4F4&#8243; background_enable_image=&#8221;off&#8221; background_size=&#8221;initial&#8221; overflow-x=&#8221;hidden&#8221; overflow-y=&#8221;hidden&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;80px||100px||false|false&#8221; custom_padding_tablet=&#8221;80px||80px||true|false&#8221; custom_padding_phone=&#8221;60px||60px||true|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row column_structure=&#8221;2_5,3_5&#8243; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;1&#8243; admin_label=&#8221;Solution&#8221; module_class=&#8221;insurance-11-inlbtn-sc&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; max_width=&#8221;1296px&#8221; max_width_tablet=&#8221;1296px&#8221; max_width_phone=&#8221;1296px&#8221; max_width_last_edited=&#8221;on|desktop&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_margin_tablet=&#8221;||0px||false|false&#8221; custom_margin_phone=&#8221;||0px||false|false&#8221; custom_margin_last_edited=&#8221;off|phone&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation_style=&#8221;fade&#8221; animation_delay=&#8221;500ms&#8221; animation_speed_curve=&#8221;ease&#8221; custom_css_main_element=&#8221;display: flex;||flex-wrap: wrap;&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;2_5&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|70px|||false|false&#8221; custom_padding_tablet=&#8221;|0px|||false|false&#8221; custom_padding_phone=&#8221;|0px|||false|false&#8221; custom_padding_last_edited=&#8221;on|tablet&#8221; global_colors_info=&#8221;{}&#8221; custom_css_main_element_last_edited=&#8221;on|tablet&#8221; custom_css_main_element_tablet=&#8221;order: 2;&#8221; custom_css_main_element_phone=&#8221;order: 2;&#8221;][et_pb_image src=&#8221;https:\/\/tpmatrix.co.uk\/wp-content\/uploads\/2026\/04\/insurance-11-kgf-9.png&#8221; disabled_on=&#8221;on|on|off&#8221; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; positioning=&#8221;absolute&#8221; vertical_offset=&#8221;-38px&#8221; horizontal_offset=&#8221;-66px&#8221; max_width=&#8221;154px&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][et_pb_image src=&#8221;https:\/\/tpmatrix.co.uk\/wp-content\/uploads\/2026\/06\/3web-SUH-Box-Test-2.jpg&#8221; title_text=&#8221;3web-SUH-Box-Test-2&#8243; force_fullwidth=&#8221;on&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; max_width_tablet=&#8221;&#8221; max_width_phone=&#8221;&#8221; max_width_last_edited=&#8221;on|phone&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; sticky_position=&#8221;top&#8221; sticky_offset_top=&#8221;130px&#8221; sticky_limit_bottom=&#8221;row&#8221; sticky_position_tablet=&#8221;none&#8221; sticky_position_phone=&#8221;none&#8221; sticky_position_last_edited=&#8221;on|desktop&#8221; border_radii=&#8221;on|8px|8px|8px|8px&#8221; global_colors_info=&#8221;{}&#8221;][\/et_pb_image][\/et_pb_column][et_pb_column type=&#8221;3_5&#8243; module_class=&#8221;pa-inline-buttons&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;|||10px|false|false&#8221; custom_padding_tablet=&#8221;70px|||0px|false|false&#8221; custom_padding_phone=&#8221;55px||||false|false&#8221; custom_padding_last_edited=&#8221;on|tablet&#8221; global_colors_info=&#8221;{}&#8221; custom_css_main_element_last_edited=&#8221;on|tablet&#8221; custom_css_main_element_tablet=&#8221;order: 1;&#8221; custom_css_main_element_phone=&#8221;order: 1;&#8221;][et_pb_text content_tablet=&#8221;<\/p>\n<h2>Project execution and results<\/h2>\n<p>&#8221; content_phone=&#8221;<\/p>\n<h2>Project execution and results<\/h2>\n<p>&#8221; content_last_edited=&#8221;on|phone&#8221; admin_label=&#8221;Title&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_2_text_align=&#8221;left&#8221; header_2_text_color=&#8221;#1F2532&#8243; header_2_font_size=&#8221;36px&#8221; header_2_line_height=&#8221;1.2em&#8221; custom_margin=&#8221;0px||15px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; header_2_font_size_tablet=&#8221;34px&#8221; header_2_font_size_phone=&#8221;30px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2>Project execution and results<\/h2>\n<p>[\/et_pb_text][et_pb_text _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_font_size=&#8221;17px&#8221; link_text_color=&#8221;#00AF4D&#8221; custom_margin=&#8221;0px||21px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221; link_text_color__hover_enabled=&#8221;on|hover&#8221; link_text_color__hover=&#8221;#1F2532&#8243;]<\/p>\n<p>The repair programme officially commenced in\u00a0<b>June 2025<\/b>. Since then, TP Matrix has repaired\u00a0<b>60+ SUH Boxes<\/b>, significantly helping to replenish float stock and reduce downtime. By addressing the root causes of failure, we have enhanced reliability and ensured the units meet operational and engineering standards.<\/p>\n<p><span style=\"color: #1f2532; font-size: 18px;\"><strong>Engineering benefits:<\/strong><\/span><\/p>\n<p>[\/et_pb_text][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Reduced repair lead times and faster return to service<\/p>\n<p>[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<p>Increased fleet availability and operational reliability<\/p>\n<p>[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]Proactive replacement of ageing components, mitigating future failures[\/et_pb_blurb][et_pb_blurb use_icon=&#8221;on&#8221; font_icon=&#8221;&#xf00c;||fa||900&#8243; icon_color=&#8221;#00AF4D&#8221; icon_placement=&#8221;left&#8221; image_icon_width=&#8221;20px&#8221; content_max_width=&#8221;100%&#8221; module_class=&#8221;about-blurb&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_text_align=&#8221;left&#8221; header_text_color=&#8221;#1F2532&#8243; header_font_size=&#8221;20px&#8221; header_line_height=&#8221;1.2em&#8221; body_font=&#8221;&#8211;et_global_body_font||||||||&#8221; body_text_align=&#8221;left&#8221; body_font_size=&#8221;17px&#8221; image_icon_custom_margin=&#8221;0px|4px|0px|0px|false|false&#8221; image_icon_custom_padding=&#8221;0px||0px||false|false&#8221; custom_margin=&#8221;||20px||false|false&#8221; custom_padding=&#8221;||0px||false|false&#8221; animation=&#8221;off&#8221; custom_css_blurb_title=&#8221;margin-bottom:3px;&#8221; custom_css_blurb_content=&#8221;margin:0px;&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221;]Fully tested and validated units ensuring compliance with safety and operational requirements[\/et_pb_blurb][et_pb_text _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_font_size=&#8221;17px&#8221; link_text_color=&#8221;#00AF4D&#8221; custom_margin=&#8221;0px||30px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; global_colors_info=&#8221;{}&#8221; link_text_color__hover_enabled=&#8221;on|hover&#8221; link_text_color__hover=&#8221;#1F2532&#8243;]<\/p>\n<p>This project demonstrates TP Matrix\u2019s expertise in\u00a0<b>rolling stock electronics repair<\/b>, providing engineering-led solutions that directly support operational efficiency and reliability for rail operators.<\/p>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_row _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; width_tablet=&#8221;90%&#8221; width_phone=&#8221;90%&#8221; width_last_edited=&#8221;on|tablet&#8221; max_width=&#8221;1296px&#8221; max_width_tablet=&#8221;1296px&#8221; max_width_phone=&#8221;1296px&#8221; max_width_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_text content_tablet=&#8221;<\/p>\n<h2>Client feedback<\/h2>\n<p>&#8221; content_phone=&#8221;<\/p>\n<h2>Client feedback<\/h2>\n<p>&#8221; content_last_edited=&#8221;on|phone&#8221; admin_label=&#8221;Title&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; header_2_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; header_2_text_align=&#8221;left&#8221; header_2_text_color=&#8221;#1F2532&#8243; header_2_font_size=&#8221;36px&#8221; header_2_line_height=&#8221;1.2em&#8221; custom_margin=&#8221;0px||15px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; header_2_font_size_tablet=&#8221;34px&#8221; header_2_font_size_phone=&#8221;30px&#8221; header_2_font_size_last_edited=&#8221;on|phone&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h2>Client feedback<\/h2>\n<p>[\/et_pb_text][et_pb_text module_class=&#8221;feedback&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; text_font=&#8221;&#8211;et_global_body_font||||||||&#8221; text_font_size=&#8221;17px&#8221; link_text_color=&#8221;#00AF4D&#8221; header_4_font=&#8221;|600|||||||&#8221; header_4_line_height=&#8221;1.4em&#8221; custom_margin=&#8221;0px||0px||false|false&#8221; custom_padding=&#8221;0px||0px||false|false&#8221; custom_css_free_form=&#8221;.feedback h4{||  margin-top: 25px;||}&#8221; global_colors_info=&#8221;{}&#8221; link_text_color__hover_enabled=&#8221;on|hover&#8221; link_text_color__hover=&#8221;#1F2532&#8243;]<\/p>\n<p><i>\u201cWe recently engaged TP Matrix to overhaul electronic boxes that connect with the bogie sensors across the entire Class 390 Pendolino fleet and the results have been outstanding. From the outset, their team demonstrated a high level of technical expertise and professionalism, ensuring the refurbishment process was smooth, efficient and aligned with our operational requirements.<\/i><\/p>\n<p><i>The quality of the work delivered was excellent, with noticeable improvements in reliability and performance post-overhaul. TP Matrix were responsive throughout, providing clear communication and timely updates, which made collaboration easy and effective. Their attention to detail and commitment to delivering a robust solution have made a significant impact, and we wouldn\u2019t hesitate to work with them again on future projects.\u201d<\/i><\/p>\n<h4>Niall Perkins \u2013 Maintenance Engineering Lead Engineer, Alstom<\/h4>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; width=&#8221;90%&#8221; max_width=&#8221;1296px&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_post_nav prev_text=&#8221;Previous Case Study&#8221; next_text=&#8221;Next Case Study&#8221; module_class=&#8221;casestudy-nav&#8221; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; title_font=&#8221;&#8211;et_global_heading_font|700|||||||&#8221; title_text_color=&#8221;#FFFFFF&#8221; title_font_size=&#8221;15px&#8221; width=&#8221;100%&#8221; custom_margin=&#8221;||60px||false|false&#8221; custom_margin_tablet=&#8221;||40px||false|false&#8221; custom_margin_phone=&#8221;||25px||false|false&#8221; custom_margin_last_edited=&#8221;on|tablet&#8221; title_font_size_tablet=&#8221;15px&#8221; title_font_size_phone=&#8221;14px&#8221; title_font_size_last_edited=&#8221;on|phone&#8221; custom_css_free_form=&#8221;.single-project.et_pb_pagebuilder_layout .nav-single {||    width: 100%;||    max-width: 1296px;||    margin: 10px auto;||}||||.casestudy-nav .nav-next {||  display: none;||}&#8221; custom_css_prev_link=&#8221;color: #FFFFFF !important;||    border-color: #00AF4D;||    border-radius: 0px;||    letter-spacing: 0.5px;||    font-size: 15px;||    font-family: &#8216;Roboto&#8217;, Helvetica, Arial, Lucida, sans-serif !important;||    font-weight: 700 !important;||    background-color: #00AF4D;||padding-top: 14px !important;||    padding-right: 26px !important;||    padding-bottom: 15px !important;||    padding-left: 26px !important;||&#8221; custom_css_next_link=&#8221;color: #FFFFFF !important;||    border-color: #00AF4D;||    border-radius: 0px;||    letter-spacing: 0.5px;||    font-size: 15px;||    font-family: &#8216;Roboto&#8217;, Helvetica, Arial, Lucida, sans-serif !important;||    font-weight: 700 !important;||    background-color: #00AF4D;||padding-top: 14px !important;||    padding-right: 26px !important;||    padding-bottom: 15px !important;||    padding-left: 26px !important;||&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; custom_css_prev_link__hover_enabled=&#8221;on|hover&#8221; custom_css_prev_link__hover=&#8221;color: #1F2532 !important;&#8221; custom_css_next_link__hover_enabled=&#8221;off|desktop&#8221; custom_css_next_link__hover=&#8221;color: #1F2532 !important;&#8221; custom_css_next_link_last_edited=&#8221;off|desktop&#8221;][\/et_pb_post_nav][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Project SummaryRepaired and tested 60+ Class 390 SUH Boxes &#8211; helping Alstom replenish float stock and reduce fleet downtime.Identified and resolved key failure causes &#8211; including water ingress and ageing network resistors affecting unit reliability.Reduced repair lead times and improved fleet availability &#8211; through a comprehensive repair and functional testing programme.Client challengesAlstom approached TP Matrix Ltd in January 2024 to explore support for their Class 390 SUH Box repairs. These units are critical to the fleet as the tilting system of the Class 390 vehicles is managed via sensors (gyros, accelerometers) on bogies, and a train-level \u201ctilt processor\u201d (TTP) that communicates with vehicle tilting processors (VTPs). Alstom faced prolonged lead times on repairs for the units. Failures were impacting fleet availability, with units often sidelined for extended periods.Investigation processTP Matrix conducted an initial assessment and repair of a two SUH Boxes, followed by\u00a0trials of the repaired units. After a successful trial in\u00a0October 2024, we were asked to provide a formal proposal for\u00a0full repair and functional testing\u00a0of the units. During the engineering assessment, two primary causes of failure were identified:Water ingress\u00a0\u2013 Moisture entering through connectors, compromising the internal electronics.Ageing network resistors\u00a0\u2013 Over time, resistor tolerances drifted, leading to intermittent or complete [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":290929,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"project_category":[],"project_tag":[],"class_list":["post-290858","project","type-project","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Enhancing SUH Box Reliability on the Class 390 Fleet | TP Matrix<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tpmatrix.co.uk\/fr\/projet\/amelioration-de-la-fiabilite-du-boitier-suh-sur-la-flotte-de-classe-390\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Enhancing SUH Box Reliability on the Class 390 Fleet | TP Matrix\" \/>\n<meta property=\"og:description\" content=\"Project SummaryRepaired and tested 60+ Class 390 SUH Boxes - helping Alstom replenish float stock and reduce fleet downtime.Identified and resolved key failure causes - including water ingress and ageing network resistors affecting unit reliability.Reduced repair lead times and improved fleet availability - through a comprehensive repair and functional testing programme.Client challengesAlstom approached TP Matrix Ltd in January 2024 to explore support for their Class 390 SUH Box repairs. These units are critical to the fleet as the tilting system of the Class 390 vehicles is managed via sensors (gyros, accelerometers) on bogies, and a train-level \u201ctilt processor\u201d (TTP) that communicates with vehicle tilting processors (VTPs). Alstom faced prolonged lead times on repairs for the units. Failures were impacting fleet availability, with units often sidelined for extended periods.Investigation processTP Matrix conducted an initial assessment and repair of a two SUH Boxes, followed by\u00a0trials of the repaired units. After a successful trial in\u00a0October 2024, we were asked to provide a formal proposal for\u00a0full repair and functional testing\u00a0of the units. During the engineering assessment, two primary causes of failure were identified:Water ingress\u00a0\u2013 Moisture entering through connectors, compromising the internal electronics.Ageing network resistors\u00a0\u2013 Over time, resistor tolerances drifted, leading to intermittent or complete [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/tpmatrix.co.uk\/fr\/projet\/amelioration-de-la-fiabilite-du-boitier-suh-sur-la-flotte-de-classe-390\/\" \/>\n<meta property=\"og:site_name\" content=\"TP Matrix\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-31T08:27:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/tpmatrix.co.uk\/wp-content\/uploads\/2026\/06\/CLass-390web-400x284-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"400\" \/>\n\t<meta property=\"og:image:height\" content=\"284\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/enhancing-suh-box-reliability-on-the-class-390-fleet\\\/\",\"url\":\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/enhancing-suh-box-reliability-on-the-class-390-fleet\\\/\",\"name\":\"Enhancing SUH Box Reliability on the Class 390 Fleet | TP Matrix\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/tpmatrix.co.uk\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/enhancing-suh-box-reliability-on-the-class-390-fleet\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/enhancing-suh-box-reliability-on-the-class-390-fleet\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/tpmatrix.co.uk\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/CLass-390web-400x284-1.jpg\",\"datePublished\":\"2025-10-21T11:48:20+00:00\",\"dateModified\":\"2026-07-31T08:27:31+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/enhancing-suh-box-reliability-on-the-class-390-fleet\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/enhancing-suh-box-reliability-on-the-class-390-fleet\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/enhancing-suh-box-reliability-on-the-class-390-fleet\\\/#primaryimage\",\"url\":\"https:\\\/\\\/tpmatrix.co.uk\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/CLass-390web-400x284-1.jpg\",\"contentUrl\":\"https:\\\/\\\/tpmatrix.co.uk\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/CLass-390web-400x284-1.jpg\",\"width\":400,\"height\":284},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/enhancing-suh-box-reliability-on-the-class-390-fleet\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/tpmatrix.co.uk\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Projects\",\"item\":\"https:\\\/\\\/tpmatrix.co.uk\\\/project\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Enhancing SUH Box Reliability on the Class 390 Fleet\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/tpmatrix.co.uk\\\/#website\",\"url\":\"https:\\\/\\\/tpmatrix.co.uk\\\/\",\"name\":\"TP Matrix\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/tpmatrix.co.uk\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Am\u00e9lioration de la fiabilit\u00e9 du bo\u00eetier SUH sur la flotte de classe 390 | Matrice TP","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/tpmatrix.co.uk\/fr\/projet\/amelioration-de-la-fiabilite-du-boitier-suh-sur-la-flotte-de-classe-390\/","og_locale":"fr_FR","og_type":"article","og_title":"Enhancing SUH Box Reliability on the Class 390 Fleet | TP Matrix","og_description":"Project SummaryRepaired and tested 60+ Class 390 SUH Boxes - helping Alstom replenish float stock and reduce fleet downtime.Identified and resolved key failure causes - including water ingress and ageing network resistors affecting unit reliability.Reduced repair lead times and improved fleet availability - through a comprehensive repair and functional testing programme.Client challengesAlstom approached TP Matrix Ltd in January 2024 to explore support for their Class 390 SUH Box repairs. These units are critical to the fleet as the tilting system of the Class 390 vehicles is managed via sensors (gyros, accelerometers) on bogies, and a train-level \u201ctilt processor\u201d (TTP) that communicates with vehicle tilting processors (VTPs). Alstom faced prolonged lead times on repairs for the units. Failures were impacting fleet availability, with units often sidelined for extended periods.Investigation processTP Matrix conducted an initial assessment and repair of a two SUH Boxes, followed by\u00a0trials of the repaired units. After a successful trial in\u00a0October 2024, we were asked to provide a formal proposal for\u00a0full repair and functional testing\u00a0of the units. During the engineering assessment, two primary causes of failure were identified:Water ingress\u00a0\u2013 Moisture entering through connectors, compromising the internal electronics.Ageing network resistors\u00a0\u2013 Over time, resistor tolerances drifted, leading to intermittent or complete [&hellip;]","og_url":"https:\/\/tpmatrix.co.uk\/fr\/projet\/amelioration-de-la-fiabilite-du-boitier-suh-sur-la-flotte-de-classe-390\/","og_site_name":"TP Matrix","article_modified_time":"2026-07-31T08:27:31+00:00","og_image":[{"width":400,"height":284,"url":"https:\/\/tpmatrix.co.uk\/wp-content\/uploads\/2026\/06\/CLass-390web-400x284-1.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Dur\u00e9e de lecture estim\u00e9e":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/tpmatrix.co.uk\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/","url":"https:\/\/tpmatrix.co.uk\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/","name":"Am\u00e9lioration de la fiabilit\u00e9 du bo\u00eetier SUH sur la flotte de classe 390 | Matrice TP","isPartOf":{"@id":"https:\/\/tpmatrix.co.uk\/#website"},"primaryImageOfPage":{"@id":"https:\/\/tpmatrix.co.uk\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/#primaryimage"},"image":{"@id":"https:\/\/tpmatrix.co.uk\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/#primaryimage"},"thumbnailUrl":"https:\/\/tpmatrix.co.uk\/wp-content\/uploads\/2026\/06\/CLass-390web-400x284-1.jpg","datePublished":"2025-10-21T11:48:20+00:00","dateModified":"2026-07-31T08:27:31+00:00","breadcrumb":{"@id":"https:\/\/tpmatrix.co.uk\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/tpmatrix.co.uk\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/tpmatrix.co.uk\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/#primaryimage","url":"https:\/\/tpmatrix.co.uk\/wp-content\/uploads\/2026\/06\/CLass-390web-400x284-1.jpg","contentUrl":"https:\/\/tpmatrix.co.uk\/wp-content\/uploads\/2026\/06\/CLass-390web-400x284-1.jpg","width":400,"height":284},{"@type":"BreadcrumbList","@id":"https:\/\/tpmatrix.co.uk\/project\/enhancing-suh-box-reliability-on-the-class-390-fleet\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/tpmatrix.co.uk\/"},{"@type":"ListItem","position":2,"name":"Projects","item":"https:\/\/tpmatrix.co.uk\/project\/"},{"@type":"ListItem","position":3,"name":"Enhancing SUH Box Reliability on the Class 390 Fleet"}]},{"@type":"WebSite","@id":"https:\/\/tpmatrix.co.uk\/#website","url":"https:\/\/tpmatrix.co.uk\/","name":"TP Matrix","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/tpmatrix.co.uk\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"}]}},"_links":{"self":[{"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/project\/290858","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/project"}],"about":[{"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/types\/project"}],"author":[{"embeddable":true,"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/comments?post=290858"}],"version-history":[{"count":1,"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/project\/290858\/revisions"}],"predecessor-version":[{"id":987507675,"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/project\/290858\/revisions\/987507675"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/media\/290929"}],"wp:attachment":[{"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/media?parent=290858"}],"wp:term":[{"taxonomy":"project_category","embeddable":true,"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/project_category?post=290858"},{"taxonomy":"project_tag","embeddable":true,"href":"https:\/\/tpmatrix.co.uk\/fr\/wp-json\/wp\/v2\/project_tag?post=290858"}],"curies":[{"name":"bien jou\u00e9","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}