{"id":4582,"date":"2026-06-23T11:20:13","date_gmt":"2026-06-23T11:20:13","guid":{"rendered":"https:\/\/www.railgrindingwheel.com\/?p=4582"},"modified":"2026-06-23T11:26:01","modified_gmt":"2026-06-23T11:26:01","slug":"lanatomie-dune-voie-ferree-comprendre-ses-principaux-composants","status":"publish","type":"post","link":"https:\/\/www.railgrindingwheel.com\/fr\/lanatomie-dune-voie-ferree-comprendre-ses-principaux-composants\/","title":{"rendered":"Anatomie d'une voie ferr\u00e9e : comprendre ses principaux composants"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"4582\" class=\"elementor elementor-4582\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e24271c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e24271c\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0584258\" data-id=\"0584258\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-d756e57 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"d756e57\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">The Anatomy of a Train Track: Understanding the Core Components<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-74894f2 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"74894f2\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0c1de1c elementor-share-buttons--view-icon elementor-share-buttons--skin-gradient elementor-share-buttons--shape-square elementor-grid-0 elementor-share-buttons--color-official elementor-widget elementor-widget-share-buttons\" data-id=\"0c1de1c\" data-element_type=\"widget\" data-widget_type=\"share-buttons.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-grid\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-grid-item\">\n\t\t\t\t\t\t<div\n\t\t\t\t\t\t\tclass=\"elementor-share-btn elementor-share-btn_linkedin\"\n\t\t\t\t\t\t\trole=\"button\"\n\t\t\t\t\t\t\ttabindex=\"0\"\n\t\t\t\t\t\t\taria-label=\"Share on linkedin\"\n\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span 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twitter\"\n\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-share-btn__icon\">\n\t\t\t\t\t\t\t\t<i class=\"fab fa-twitter\" aria-hidden=\"true\"><\/i>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0815c27 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"0815c27\" data-element_type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;marker_view&quot;:&quot;bullets&quot;,&quot;icon&quot;:{&quot;value&quot;:&quot;&quot;,&quot;library&quot;:&quot;&quot;},&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;,&quot;h6&quot;],&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of Contents\t\t\t<\/h4>\n\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__0815c27\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__0815c27\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t<div id=\"elementor-toc__0815c27\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-68cd1ee elementor-widget elementor-widget-image\" data-id=\"68cd1ee\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"414\" height=\"483\" src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Ballast-and-Subgrade.jpg\" class=\"attachment-large size-large wp-image-4587\" alt=\"Ballast and Subgrade\" srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Ballast-and-Subgrade.jpg 414w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Ballast-and-Subgrade-257x300.jpg.webp 257w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Ballast-and-Subgrade-10x12.jpg 10w\" sizes=\"(max-width: 414px) 100vw, 414px\" data-smush-webp-fallback=\"{&quot;srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Ballast-and-Subgrade.jpg 414w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Ballast-and-Subgrade-257x300.jpg 257w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Ballast-and-Subgrade-10x12.jpg 10w&quot;}\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0bea582 elementor-widget elementor-widget-text-editor\" data-id=\"0bea582\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"4\">When we look at a train track, it might seem like a straightforward combination of steel and stone. However, beneath the surface lies a highly sophisticated engineering system. Every single train track around the world is designed to withstand immense structural stress, support massive axle loads, and ensure the smooth, safe transit of passengers and freight.<\/p><p data-path-to-node=\"5\">Whether you are managing a logistics line or studying railway infrastructure, understanding how a train track is built is essential. In this guide, we break down the vital components that keep modern railway systems moving forward.<\/p><h2 data-path-to-node=\"7\">1. The Steel Rails: Guiding the Journey<\/h2><p data-path-to-node=\"8\">At the very top of any <b data-path-to-node=\"8\" data-index-in-node=\"23\">train track<\/b> are the steel rails. Typically engineered with an asymmetrical I-beam profile, these rails provide a continuous, smooth surface that minimizes wheel friction.<\/p><p data-path-to-node=\"9\">But their job goes beyond just guiding the locomotive. The steel rails are the primary point of contact that absorbs the initial impact of the train&#8217;s weight, immediately dispersing these tremendous forces downward to the supporting structure beneath.<\/p><h2 data-path-to-node=\"10\">2. Sleepers and Ties: The Backbone of Gauge Integrity<\/h2><figure id=\"attachment_4584\" aria-describedby=\"caption-attachment-4584\" style=\"width: 600px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4584 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/transverse-rail-sleepers.jpg\" alt=\"Sleepers and Ties\" width=\"600\" height=\"409\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/transverse-rail-sleepers.jpg 600w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/transverse-rail-sleepers-300x205.jpg.webp 300w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/transverse-rail-sleepers-18x12.jpg.webp 18w\" data-sizes=\"(max-width: 600px) 100vw, 600px\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 600px; --smush-placeholder-aspect-ratio: 600\/409;\" data-smush-webp-fallback=\"{&quot;data-srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/transverse-rail-sleepers.jpg 600w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/transverse-rail-sleepers-300x205.jpg 300w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/transverse-rail-sleepers-18x12.jpg 18w&quot;}\" \/><figcaption id=\"caption-attachment-4584\" class=\"wp-caption-text\">Sleepers and Ties<\/figcaption><\/figure><p data-path-to-node=\"11\">Positioned perpendicularly beneath the rails are the railroad ties, also known as sleepers. While traditional <b data-path-to-node=\"11\" data-index-in-node=\"110\">train track<\/b> construction relied heavily on timber, modern high-stress lines predominantly utilize pre-stressed concrete or advanced composite materials.<\/p><p data-path-to-node=\"12\">Sleepers serve a dual purpose:<\/p><ul data-path-to-node=\"13\"><li><p data-path-to-node=\"13,0,0\">They lock the steel rails in place to maintain a precise track gauge (the distance between the rails).<\/p><\/li><li><p data-path-to-node=\"13,1,0\">They possess a calculated elasticity\u2014flexing slightly under the immense weight of a passing train and springing back into shape to cushion the structural impact.<\/p><\/li><\/ul><h2 data-path-to-node=\"14\">3. Rail Fastening Systems: The Unsung Heroes of Stability<\/h2><div><figure id=\"attachment_4585\" aria-describedby=\"caption-attachment-4585\" style=\"width: 647px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4585 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Fastening-Systems.jpg\" alt=\"Rail Fastening Systems\" width=\"647\" height=\"309\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Fastening-Systems.jpg 647w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Fastening-Systems-300x143.jpg 300w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Rail-Fastening-Systems-18x9.jpg 18w\" data-sizes=\"(max-width: 647px) 100vw, 647px\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 647px; --smush-placeholder-aspect-ratio: 647\/309;\" \/><figcaption id=\"caption-attachment-4585\" class=\"wp-caption-text\">Rail Fastening Systems<\/figcaption><\/figure><\/div><p data-path-to-node=\"15\">A <b data-path-to-node=\"15\" data-index-in-node=\"2\">train track<\/b> cannot function safely without a reliable fastening network. This system includes a variety of specialized components such as elastic rail clips, heavy-duty clamps, tie plates, rubber rail pads, and joint bars (fishplates).<\/p><p data-path-to-node=\"16\">Together, these fasteners secure the rail firmly to the sleepers. By providing strong clamping force, they prevent the track from shifting laterally or longitudinally, absorb high-frequency wheel vibrations, and significantly delay track deformation over time.<\/p><h2 data-path-to-node=\"17\">4. Railroad Turnouts (Switches): Directing the Traffic Flow<\/h2><figure id=\"attachment_4586\" aria-describedby=\"caption-attachment-4586\" style=\"width: 393px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4586 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Railroad-Turnouts-Switches.png\" alt=\"Railroad Turnouts (Switches)\" width=\"393\" height=\"508\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Railroad-Turnouts-Switches.png 393w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Railroad-Turnouts-Switches-232x300.png.webp 232w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Railroad-Turnouts-Switches-9x12.png.webp 9w\" data-sizes=\"(max-width: 393px) 100vw, 393px\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 393px; --smush-placeholder-aspect-ratio: 393\/508;\" data-smush-webp-fallback=\"{&quot;data-srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Railroad-Turnouts-Switches.png 393w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Railroad-Turnouts-Switches-232x300.png 232w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Railroad-Turnouts-Switches-9x12.png 9w&quot;}\" \/><figcaption id=\"caption-attachment-4586\" class=\"wp-caption-text\">Railroad Turnouts (Switches)<\/figcaption><\/figure><p data-path-to-node=\"18\">A dynamic railway network requires flexibility, which is where turnouts or switches come into play. These specialized <b data-path-to-node=\"18\" data-index-in-node=\"118\">train track<\/b> mechanisms allow a train to seamlessly guide from one line to another.<\/p><p data-path-to-node=\"19\">By installing turnouts, rail networks can maximize their track capacity, allowing trains to bypass one another at stations, switch between transit lines, and navigate complex railyards safely.<\/p><h2 data-path-to-node=\"20\">5. Ballast and Subgrade: The Ultimate Foundation<\/h2><div><figure id=\"attachment_4587\" aria-describedby=\"caption-attachment-4587\" style=\"width: 414px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"size-full wp-image-4587 lazyload\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Ballast-and-Subgrade.jpg\" alt=\"Ballast and Subgrade\" width=\"414\" height=\"483\" data-srcset=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Ballast-and-Subgrade.jpg 414w, https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2026\/06\/Ballast-and-Subgrade-257x300.jpg.webp 257w, https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/06\/Ballast-and-Subgrade-10x12.jpg 10w\" data-sizes=\"(max-width: 414px) 100vw, 414px\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 414px; --smush-placeholder-aspect-ratio: 414\/483;\" data-smush-webp-fallback=\"{&quot;data-srcset&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Ballast-and-Subgrade.jpg 414w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Ballast-and-Subgrade-257x300.jpg 257w, https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/Ballast-and-Subgrade-10x12.jpg 10w&quot;}\" \/><figcaption id=\"caption-attachment-4587\" class=\"wp-caption-text\">Ballast and Subgrade<\/figcaption><\/figure><\/div><p data-path-to-node=\"21\">The crushed stone base surrounding the sleepers is called the <a href=\"https:\/\/www.sciencedirect.com\/topics\/engineering\/ballast-bed\">ballast bed<\/a>, resting on top of the natural ground infrastructure known as the subgrade.<\/p><p data-path-to-node=\"22\">The ballast layer performs several critical functions for the <b data-path-to-node=\"22\" data-index-in-node=\"62\">train track<\/b>:<\/p><ul data-path-to-node=\"23\"><li><p data-path-to-node=\"23,0,0\">It forms a stable yet flexible bed that evenly distributes weight to the soil below.<\/p><\/li><li><p data-path-to-node=\"23,1,0\">It prevents track shifting by anchoring the ties firmly in place.<\/p><\/li><li><p data-path-to-node=\"23,2,0\">It provides rapid drainage for rainwater to prevent soil erosion and mud pumping.<\/p><\/li><li><p data-path-to-node=\"23,3,0\">\u5b83 naturally blocks weed growth from disrupting the track structure.<\/p><\/li><\/ul><h3 data-path-to-node=\"25\">Conclusion: Engineering Longevity into Modern Rail Infrastructure<\/h3><p data-path-to-node=\"26\">Every component of a <b data-path-to-node=\"26\" data-index-in-node=\"21\">train track<\/b> works in perfect harmony to ensure operational efficiency and safety. For railway operators and <a href=\"https:\/\/www.railgrindingwheel.com\/rail-grinding-classification-and-application-scenarios\/\">maintenance<\/a> teams, choosing high-performance components\u2014from optimized rail profiles to resilient fastening clips\u2014is the key to reducing lifecycle costs and preventing slow-zones.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6e6df0d elementor-post-navigation-borders-yes elementor-widget elementor-widget-post-navigation\" data-id=\"6e6df0d\" data-element_type=\"widget\" data-widget_type=\"post-navigation.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-post-navigation\">\n\t\t\t<div class=\"elementor-post-navigation__prev elementor-post-navigation__link\">\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-post-navigation__separator-wrapper\">\n\t\t\t\t\t<div class=\"elementor-post-navigation__separator\"><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<div class=\"elementor-post-navigation__next elementor-post-navigation__link\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvrez les principes techniques fondamentaux qui sous-tendent une voie ferr\u00e9e moderne. Apprenez comment les rails, les traverses, les fixations et le ballast fonctionnent ensemble pour garantir la s\u00e9curit\u00e9 et la durabilit\u00e9 du r\u00e9seau ferroviaire.<\/p>","protected":false},"author":4,"featured_media":4587,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"right-sidebar","site-content-layout":"","ast-site-content-layout":"normal-width-container","site-content-style":"default","site-sidebar-style":"boxed","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"disabled","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"disabled","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[88],"tags":[],"class_list":["post-4582","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is a Train Track Made Of? 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