{"id":21425,"date":"2026-07-07T17:16:05","date_gmt":"2026-07-07T15:16:05","guid":{"rendered":"https:\/\/www.clearsy.com\/?p=21425"},"modified":"2026-07-07T17:16:05","modified_gmt":"2026-07-07T15:16:05","slug":"sil4-signalling-changeover-unit-deployment","status":"publish","type":"post","link":"https:\/\/www.clearsy.com\/en\/railway\/sil4-signalling-changeover-unit-deployment\/","title":{"rendered":"SIL4 Signalling changeover unit deployment"},"content":{"rendered":"<p><span data-contrast=\"auto\">CLEARSY supplies Hitachi Rail\u00a0with\u00a0SIL4\u00a0safety latching interface system\u00a0designed\u00a0to replace railway\u00a0signalling\u00a0systems. This\u00a0equipment\u00a0ensures\u00a0a fast,\u00a0simple\u00a0and\u00a0secure\u00a0switchover\u00a0between\u00a0the\u00a0old\u00a0and new\u00a0systems,\u00a0which\u00a0is\u00a0essential for\u00a0operations.\u00a0<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:0,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:279}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">The validation of\u00a0complex\u00a0systems\u00a0generally\u00a0requires\u00a0several\u00a0test\u00a0campaigns\u00a0before\u00a0they\u00a0are put\u00a0into\u00a0service. During\u00a0this\u00a0period, the\u00a0old\u00a0signalling\u00a0system continues to\u00a0operate\u00a0during\u00a0the\u00a0day,\u00a0whilst\u00a0the CLEARSY\u00a0switchover\u00a0unit enables the new system to\u00a0be\u00a0tested\u00a0at night.\u00a0\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">Thanks to the CLEARSY\u00a0<\/span><span data-contrast=\"auto\">SIL4\u00a0signalling\u00a0changeover\u00a0unit,<\/span><span data-contrast=\"auto\">\u00a0which is\u00a0able\u00a0to\u00a0manage\u00a0over 200 contacts, the processes of migrating and simultaneously connecting the two systems (Y-connection) are\u00a0considerably simplified. It enables the rapid connection of new installations undergoing validation, as well as an immediate return to the original configuration when operations resume, whilst ensuring that the SIL4 safety level is\u00a0maintained.<\/span><span data-ccp-props=\"{&quot;134233117&quot;:false,&quot;134233118&quot;:false,&quot;201341983&quot;:0,&quot;335551550&quot;:1,&quot;335551620&quot;:1,&quot;335559685&quot;:0,&quot;335559737&quot;:0,&quot;335559738&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:279}\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>CLEARSY supplies Hitachi Rail\u00a0with\u00a0SIL4\u00a0safety latching interface system\u00a0designed\u00a0to replace railway\u00a0signalling\u00a0systems. This\u00a0equipment\u00a0ensures\u00a0a fast,\u00a0simple\u00a0and\u00a0secure\u00a0switchover\u00a0between\u00a0the\u00a0old\u00a0and new\u00a0systems,\u00a0which\u00a0is\u00a0essential for\u00a0operations.\u00a0\u00a0 The validation of\u00a0complex\u00a0systems\u00a0generally\u00a0requires\u00a0several\u00a0test\u00a0campaigns\u00a0before\u00a0they\u00a0are put\u00a0into\u00a0service. During\u00a0this\u00a0period, the\u00a0old\u00a0signalling\u00a0system continues [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":21422,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[679,682,1551],"tags":[],"class_list":["post-21425","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-the-components","category-railway","category-surete-de-fonctionnement-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SIL4 Signalling changeover unit deployment - CLEARSY<\/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:\/\/www.clearsy.com\/en\/railway\/sil4-signalling-changeover-unit-deployment\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SIL4 Signalling changeover unit deployment - CLEARSY\" \/>\n<meta property=\"og:description\" content=\"CLEARSY supplies Hitachi Rail\u00a0with\u00a0SIL4\u00a0safety latching interface system\u00a0designed\u00a0to replace railway\u00a0signalling\u00a0systems. This\u00a0equipment\u00a0ensures\u00a0a fast,\u00a0simple\u00a0and\u00a0secure\u00a0switchover\u00a0between\u00a0the\u00a0old\u00a0and new\u00a0systems,\u00a0which\u00a0is\u00a0essential for\u00a0operations.\u00a0\u00a0 The validation of\u00a0complex\u00a0systems\u00a0generally\u00a0requires\u00a0several\u00a0test\u00a0campaigns\u00a0before\u00a0they\u00a0are put\u00a0into\u00a0service. 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