{"id":12502,"date":"2020-06-10T17:45:05","date_gmt":"2020-06-10T16:45:05","guid":{"rendered":"https:\/\/stage.prover.com\/?p=12502"},"modified":"2025-01-16T11:28:28","modified_gmt":"2025-01-16T10:28:28","slug":"signal-modernization-at-stockholm-metro","status":"publish","type":"post","link":"https:\/\/www.prover.com\/guide\/signal-modernization-at-stockholm-metro\/","title":{"rendered":"Signal modernization at Stockholm Metro"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:0px;--awb-padding-right:0px;--awb-padding-bottom:0px;--awb-padding-left:0px;--awb-margin-top:0px;--awb-margin-bottom:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1280px + 80px );margin-left: calc(-80px \/ 2 );margin-right: calc(-80px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_2 1_2 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:calc( 0.1 * calc( 100% - 80px ) );--awb-margin-bottom-large:0px;--awb-spacing-left-large:40px;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:calc( 0.1 * calc( 100% - 80px ) );--awb-spacing-left-medium:40px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:40px;--awb-spacing-left-small:40px;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-text fusion-title-size-six\" style=\"--awb-margin-top:0px;--awb-margin-top-small:0px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;\"><h6 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;text-transform:uppercase;\">Your Content Goes Here<\/h6><\/div><div class=\"fusion-title title fusion-title-2 fusion-sep-none fusion-title-text fusion-title-size-one\" style=\"--awb-margin-top:0px;--awb-margin-bottom:25px;--awb-margin-top-small:10px;--awb-margin-right-small:0px;--awb-margin-bottom-small:30px;--awb-margin-left-small:0px;\"><h1 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;text-transform:none;\">Signal modernization at Stockholm Metro<\/h1><\/div><div class=\"fusion-text fusion-text-1 fusion-text-no-margin\" style=\"--awb-margin-top:0px;--awb-margin-right:0px;--awb-margin-bottom:0px;--awb-margin-left:0px;\"><p>Stockholm Metro has a diverse and complex network with light rail, suburban rail and subway systems. Its signaling systems are a mix of computerized and relay-based interlockings, with modern, centralized traffic management systems.<\/p>\n<p>We will take a closer look at two distinct projects of Stockholm Metro; the extension of one of the subway lines using legacy union switch & signal relay-based interlocking and the capacity increase project on a suburban rail line utilizing modern computerized interlockings.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-3 fusion-sep-none fusion-title-text fusion-title-size-five\" style=\"--awb-margin-top:40px;--awb-margin-bottom:5px;--awb-margin-top-small:30px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;\"><h5 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;text-transform:none;\">In this guide you will learn:<\/h5><\/div><ul style=\"--awb-size:17px;--awb-margin-top:20px;--awb-margin-right:0px;--awb-margin-bottom:20px;--awb-margin-left:0px;--awb-line-height:28.9px;--awb-icon-width:28.9px;--awb-icon-height:28.9px;--awb-icon-margin:11.9px;--awb-content-margin:40.8px;--awb-circlecolor:var(--awb-color3);--awb-circle-yes-font-size:14.96px;\" class=\"fusion-checklist fusion-checklist-1 fusion-checklist-default type-icons\"><li class=\"fusion-li-item\" style=\"\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-check fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">\n<p>How a modern automation process can be applied<\/p>\n<\/div><\/li><li class=\"fusion-li-item\" style=\"\"><span class=\"icon-wrapper circle-yes\"><i class=\"fusion-li-icon fa-check fas\" aria-hidden=\"true\"><\/i><\/span><div class=\"fusion-li-item-content\">\n<p>Lessons from two distinct projects of Stockholm Metro<\/p>\n<\/div><\/li><\/ul><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_2 1_2 fusion-flex-column inv-form\" style=\"--awb-bg-color:var(--awb-color3);--awb-bg-color-hover:var(--awb-color3);--awb-bg-size:cover;--awb-width-large:50%;--awb-margin-top-large:0px;--awb-spacing-right-large:40px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:40px;--awb-width-medium:50%;--awb-order-medium:0;--awb-spacing-right-medium:40px;--awb-spacing-left-medium:40px;--awb-width-small:100%;--awb-order-small:0;--awb-margin-top-small:40px;--awb-spacing-right-small:40px;--awb-spacing-left-small:40px;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-image-element \" style=\"--awb-aspect-ratio:2 \/ 1;--awb-margin-top:0px;--awb-margin-right:0px;--awb-margin-bottom:0px;--awb-margin-left:0px;--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none has-aspect-ratio\"><img decoding=\"async\" width=\"798\" height=\"453\" src=\"https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Successful-rail-control-projects-with-Signaling-Design-Automation-jpg.webp\" data-orig-src=\"https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Successful-rail-control-projects-with-Signaling-Design-Automation-jpg.webp\" class=\"lazyload img-responsive wp-image-12337 img-with-aspect-ratio\" data-parent-fit=\"cover\" data-parent-container=\".fusion-image-element\" alt srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27798%27%20height%3D%27453%27%20viewBox%3D%270%200%20798%20453%27%3E%3Crect%20width%3D%27798%27%20height%3D%27453%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Successful-rail-control-projects-with-Signaling-Design-Automation-200x114.webp 200w, https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Successful-rail-control-projects-with-Signaling-Design-Automation-400x227.webp 400w, https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Successful-rail-control-projects-with-Signaling-Design-Automation-600x341.webp 600w, https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Successful-rail-control-projects-with-Signaling-Design-Automation-jpg.webp 798w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 840px) 100vw, 798px\" \/><\/span><\/div><div class=\"fusion-builder-row fusion-builder-row-inner fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"--awb-flex-grow:0;--awb-flex-grow-medium:0;--awb-flex-grow-small:0;--awb-flex-shrink:0;--awb-flex-shrink-medium:0;--awb-flex-shrink-small:0;width:calc( 100% + 80px ) !important;max-width:calc( 100% + 80px ) !important;margin-left: calc(-80px \/ 2 );margin-right: calc(-80px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column_inner fusion-builder-nested-column-0 fusion_builder_column_inner_1_1 1_1 fusion-flex-column\" style=\"--awb-padding-top:40px;--awb-padding-right:50px;--awb-padding-bottom:40px;--awb-padding-left:50px;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:40px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:40px;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:40px;--awb-spacing-left-medium:40px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:40px;--awb-spacing-left-small:40px;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-4 fusion-sep-none fusion-title-text fusion-title-size-four\" style=\"--awb-text-color:var(--awb-color1);--awb-margin-top-small:10px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;\"><h4 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;text-transform:none;\">Yes please, send me the guide!<\/h4><\/div>\n\t\t\t\t\t\t<script>\n\t\t\t\t\t\t\twindow.hsFormsOnReady = window.hsFormsOnReady || [];\n\t\t\t\t\t\t\twindow.hsFormsOnReady.push(()=>{\n\t\t\t\t\t\t\t\thbspt.forms.create({\n\t\t\t\t\t\t\t\t\tportalId: 26789739,\n\t\t\t\t\t\t\t\t\tformId: \"a4c79f57-61d9-47e2-9980-f5bb34d6fa34\",\n\t\t\t\t\t\t\t\t\ttarget: \"#hbspt-form-1776215892000-7115009929\",\n\t\t\t\t\t\t\t\t\tregion: \"eu1\",\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t})});\n\t\t\t\t\t\t<\/script>\n\t\t\t\t\t\t<div class=\"hbspt-form\" id=\"hbspt-form-1776215892000-7115009929\"><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-margin-top:80px;--awb-margin-bottom:20px;--awb-background-color:var(--awb-custom_color_4);--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:calc( 1280px + 80px );margin-left: calc(-80px \/ 2 );margin-right: calc(-80px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-2 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-padding-top:60px;--awb-padding-right:20px;--awb-padding-bottom:60px;--awb-padding-left:20px;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:40px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:40px;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:40px;--awb-spacing-left-medium:40px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:40px;--awb-spacing-left-small:40px;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-5 fusion-sep-none fusion-title-text fusion-title-size-two\" style=\"--awb-margin-top-small:10px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;\"><h2 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;text-transform:none;\">Table of Content<\/h2><\/div><div class=\"fusion-text fusion-text-2\"><ol>\n<li>Introduction<\/li>\n<li>Formal Verification and Checkers for Relay-Based Interlocking<\/li>\n<li>Code Generation for Computer-Based Interlocking<\/li>\n<\/ol>\n<\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-3 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-padding-top:60px;--awb-padding-bottom:80px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-center fusion-flex-justify-content-center fusion-flex-content-wrap\" style=\"max-width:calc( 1280px + 80px );margin-left: calc(-80px \/ 2 );margin-right: calc(-80px \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-3 fusion_builder_column_2_3 2_3 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:66.666666666667%;--awb-margin-top-large:0px;--awb-spacing-right-large:40px;--awb-margin-bottom-large:20px;--awb-spacing-left-large:40px;--awb-width-medium:66.666666666667%;--awb-order-medium:0;--awb-spacing-right-medium:40px;--awb-spacing-left-medium:40px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:40px;--awb-spacing-left-small:40px;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-6 fusion-sep-none fusion-title-text fusion-title-size-six\" style=\"--awb-margin-bottom:5px;--awb-margin-top-small:10px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;\"><h6 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;text-transform:uppercase;\">Introduction<\/h6><\/div><div class=\"fusion-title title fusion-title-7 fusion-sep-none fusion-title-text fusion-title-size-three\" style=\"--awb-margin-bottom:30px;--awb-margin-top-small:10px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;--awb-font-size:24pt;\"><h3 class=\"fusion-title-heading title-heading-left\" style=\"font-family:var(--awb-typography3-font-family);font-weight:var(--awb-typography3-font-weight);font-style:var(--awb-typography3-font-style);margin:0;letter-spacing:var(--awb-typography3-letter-spacing);text-transform:var(--awb-typography3-text-transform);font-size:1em;line-height:var(--awb-typography3-line-height);\">How a modern automation process can improve both relay- and computer-based interlocking<\/h3><\/div><div class=\"fusion-image-element \" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-2 hover-type-none\"><img decoding=\"async\" width=\"800\" height=\"450\" alt=\"Signal Modernization at Stockholm Metro\" title=\"Signal Modernization at Stockholm Metro\" src=\"https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Signal-Modernization-at-Stockholm-Metro-jpg.webp\" data-orig-src=\"https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Signal-Modernization-at-Stockholm-Metro-jpg.webp\" class=\"lazyload img-responsive wp-image-12432\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27800%27%20height%3D%27450%27%20viewBox%3D%270%200%20800%20450%27%3E%3Crect%20width%3D%27800%27%20height%3D%27450%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Signal-Modernization-at-Stockholm-Metro-200x113.webp 200w, https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Signal-Modernization-at-Stockholm-Metro-400x225.webp 400w, https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Signal-Modernization-at-Stockholm-Metro-600x338.webp 600w, https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Signal-Modernization-at-Stockholm-Metro-jpg.webp 800w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 840px) 100vw, 800px\" \/><\/span><\/div><div class=\"fusion-text fusion-text-3 fusion-text-no-margin\" style=\"--awb-margin-top:60px;--awb-margin-bottom:40px;\"><p>Stockholm Metro has a diverse and complex network with light rail, suburban rail and subway systems. Its signaling systems are a mix of computerized and relay-based interlockings, with modern, centralized traffic management systems.<\/p>\n<p>Maintaining and upgrading these systems to the standards of a modern mass transit facing ever increasing passenger numbers is challenging, from a cost and resource perspective as well as from a safety perspective. In order to address this, Stockholm Metro has deployed modern Signal Design Automation processes covering both safety verification and development of interlocking application software.<\/p>\n<p>In this guide we will take a closer look at two distinct projects of Stockholm Metro; the extension of one of the subway lines using legacy Union Switch &amp; Signal relay-based interlocking and the capacity increase project on a suburban rail line utilizing modern computerized interlockings. The relay-based interlockings are designed using traditional methods but with automatic checks of schematics, and safety is verified with automated formal verification. The computerized interlockings are generated, tested, and verified with a design automation process based on generic and formalized requirement specifications.<\/p>\n<\/div><\/div><\/div><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-4 fusion_builder_column_2_3 2_3 fusion-flex-column inv-form\" style=\"--awb-padding-top:50px;--awb-padding-right:50px;--awb-padding-bottom:40px;--awb-padding-left:50px;--awb-bg-color:var(--awb-color3);--awb-bg-color-hover:var(--awb-color3);--awb-bg-size:cover;--awb-width-large:66.666666666667%;--awb-margin-top-large:0px;--awb-spacing-right-large:0px;--awb-margin-bottom-large:0px;--awb-spacing-left-large:40px;--awb-width-medium:66.666666666667%;--awb-order-medium:0;--awb-spacing-right-medium:0px;--awb-spacing-left-medium:40px;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:40px;--awb-spacing-left-small:40px;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-8 fusion-sep-none fusion-title-text fusion-title-size-four\" style=\"--awb-text-color:var(--awb-color1);--awb-margin-bottom:10px;--awb-margin-top-small:10px;--awb-margin-right-small:0px;--awb-margin-bottom-small:10px;--awb-margin-left-small:0px;\"><h4 class=\"fusion-title-heading title-heading-left\" style=\"margin:0;text-transform:none;\">Fill out the form to read the full guide.<\/h4><\/div>\n\t\t\t\t\t\t<script>\n\t\t\t\t\t\t\twindow.hsFormsOnReady = window.hsFormsOnReady || [];\n\t\t\t\t\t\t\twindow.hsFormsOnReady.push(()=>{\n\t\t\t\t\t\t\t\thbspt.forms.create({\n\t\t\t\t\t\t\t\t\tportalId: 26789739,\n\t\t\t\t\t\t\t\t\tformId: \"a4c79f57-61d9-47e2-9980-f5bb34d6fa34\",\n\t\t\t\t\t\t\t\t\ttarget: \"#hbspt-form-1776215892000-3366839890\",\n\t\t\t\t\t\t\t\t\tregion: \"eu1\",\n\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t})});\n\t\t\t\t\t\t<\/script>\n\t\t\t\t\t\t<div class=\"hbspt-form\" id=\"hbspt-form-1776215892000-3366839890\"><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stockholm Metro has a diverse and complex network with light rail, suburban rail and subway systems. Its signaling systems are a mix of computerized and relay-based interlockings, with modern, centralized traffic management systems.<\/p>\n<p>We will take a closer look at two distinct projects of Stockholm Metro; the extension of one of the subway lines using legacy union switch &#038; signal relay-based interlocking and the capacity increase project on a suburban rail line utilizing modern computerized interlockings.<\/p>\n","protected":false},"author":16,"featured_media":12337,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","inline_featured_image":false,"footnotes":""},"categories":[163,151],"tags":[],"class_list":["post-12502","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guide","category-signaling-systems"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Signal modernization at Stockholm Metro - Prover - Engineering a Safer World<\/title>\n<meta name=\"description\" content=\"We take a look at two projects of Stockholm Metro, and how a modern automation process can improve relay- and computer-based interlocking.\" \/>\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.prover.com\/guide\/signal-modernization-at-stockholm-metro\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Signal modernization at Stockholm Metro - Prover - Engineering a Safer World\" \/>\n<meta property=\"og:description\" content=\"We take a look at two projects of Stockholm Metro, and how a modern automation process can improve relay- and computer-based interlocking.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.prover.com\/guide\/signal-modernization-at-stockholm-metro\/\" \/>\n<meta property=\"og:site_name\" content=\"Prover - Engineering a Safer World\" \/>\n<meta property=\"article:published_time\" content=\"2020-06-10T16:45:05+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-01-16T10:28:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Successful-rail-control-projects-with-Signaling-Design-Automation-jpg.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"798\" \/>\n\t<meta property=\"og:image:height\" content=\"453\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Gunnar Smith\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Gunnar Smith\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.prover.com\/guide\/signal-modernization-at-stockholm-metro\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.prover.com\/guide\/signal-modernization-at-stockholm-metro\/\"},\"author\":{\"name\":\"Gunnar Smith\",\"@id\":\"https:\/\/prover.com\/#\/schema\/person\/8fffe4665a1bd6297a1a72afbe980a10\"},\"headline\":\"Signal modernization at Stockholm Metro\",\"datePublished\":\"2020-06-10T16:45:05+00:00\",\"dateModified\":\"2025-01-16T10:28:28+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.prover.com\/guide\/signal-modernization-at-stockholm-metro\/\"},\"wordCount\":4102,\"publisher\":{\"@id\":\"https:\/\/prover.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.prover.com\/guide\/signal-modernization-at-stockholm-metro\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.prover.com\/wp-content\/uploads\/2023\/04\/Successful-rail-control-projects-with-Signaling-Design-Automation-jpg.webp\",\"articleSection\":[\"Guide\",\"Signaling systems\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.prover.com\/guide\/signal-modernization-at-stockholm-metro\/\",\"url\":\"https:\/\/www.prover.com\/guide\/signal-modernization-at-stockholm-metro\/\",\"name\":\"Signal modernization at Stockholm Metro - 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