{"id":1896,"date":"2025-10-16T02:47:08","date_gmt":"2025-10-16T02:47:08","guid":{"rendered":"https:\/\/www.railgrindingwheel.com\/?page_id=1896"},"modified":"2026-10-29T06:51:01","modified_gmt":"2026-10-29T06:51:01","slug":"gemac-cmc20","status":"publish","type":"page","link":"https:\/\/www.railgrindingwheel.com\/tr\/gemac-cmc20\/","title":{"rendered":"GEMAC CMC20"},"content":{"rendered":"<style>\n.rgw-cmc20{--blue:#075ca8;--navy:#072a45;--pale:#f2f6f8;--line:#d4e0e7;--ink:#14344b;--muted:#5d7281;color:var(--ink);font-family:Montserrat,Arial,sans-serif}.rgw-cmc20 *{box-sizing:border-box}.rgw-cmc20 a{color:var(--blue)}.rgw-shell{width:min(1180px,calc(100% - 36px));margin:auto}.rgw-breadcrumb{padding:16px 0;color:#637887;font-size:13px}.rgw-hero{padding:56px 0;color:#fff;background:linear-gradient(120deg,#061d31,#0a3557 72%,#075ca8)}.rgw-hero-grid{display:grid;grid-template-columns:1fr 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#dce5ea;background:#f8fafb}.rgw-wheel-body{display:grid;grid-template-columns:minmax(250px,38%) 1fr;align-items:center}.rgw-wheel-photo{margin:28px}.rgw-wheel-photo img{display:block;width:100%;aspect-ratio:3\/4;object-fit:contain}.rgw-wheel-copy{padding:30px 34px 30px 4px}.rgw-wheel-specs{display:grid;grid-template-columns:1fr 1fr;margin:0;border:1px solid var(--line)}.rgw-wheel-specs div{padding:15px;border-bottom:1px solid var(--line)}.rgw-wheel-specs dt{color:#738692;font-size:10px;font-weight:800;text-transform:uppercase}.rgw-wheel-specs dd{margin:5px 0 0;font-size:13px;font-weight:800}.rgw-caution{margin:20px 0;padding:14px;color:#765234;background:#fff3e8;font-size:11px;line-height:1.6}.rgw-checklist{display:grid;grid-template-columns:1fr 1fr;border:1px solid var(--line);background:#fff}.rgw-checklist div{padding:15px;border-bottom:1px solid var(--line);font-size:12px;font-weight:700}.rgw-faq details{border-top:1px solid #cbd7df;background:#fff}.rgw-faq summary{padding:17px 19px;cursor:pointer;font:700 14px \"Roboto Slab\",Georgia,serif}.rgw-faq details p{margin:0;padding:0 19px 18px;color:#607584;font-size:12px;line-height:1.7}.rgw-references{margin-top:44px;padding-top:22px;border-top:1px solid #bdccd5}.rgw-references li{padding:5px 0;color:#607482;font-size:11px;line-height:1.5}.rgw-aside{position:sticky;top:100px}.rgw-info,.rgw-rfq{border:1px solid #cad7df;background:#fff}.rgw-info-head{padding:14px;background:#eef3f6}.rgw-info dl{margin:0}.rgw-info dl div{display:grid;grid-template-columns:105px 1fr;gap:8px;padding:10px 13px;border-top:1px solid #e0e7eb;font-size:11px}.rgw-info dd{margin:0;font-weight:700}.rgw-rfq{margin-top:15px;padding:22px;color:#fff;background:#073b63}.rgw-rfq p{color:#c2d5e1;font-size:11px;line-height:1.6}.rgw-rfq .rgw-btn{display:block;color:#103b56!important;background:#fff}.rgw-related{padding:54px 0;background:#fff}.rgw-related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.rgw-related-grid a{padding:20px;border:1px solid var(--line);text-decoration:none}.rgw-related-grid strong{display:block;margin:7px 0;font:700 21px \"Roboto Slab\",Georgia,serif}.rgw-related-grid span{color:#667b89;font-size:11px}.rgw-related-grid .rgw-library{color:#fff;background:#0b3d5d}.rgw-related-grid .rgw-library span{color:#c5d7e1}@media(max-width:760px){.rgw-hero-grid,.rgw-layout,.rgw-wheel-body{grid-template-columns:1fr}.rgw-aside{position:static}.rgw-facts,.rgw-gallery,.rgw-usecases,.rgw-process,.rgw-checklist,.rgw-related-grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.rgw-facts,.rgw-gallery,.rgw-usecases,.rgw-process,.rgw-checklist,.rgw-related-grid,.rgw-wheel-specs{grid-template-columns:1fr}.rgw-spec-row{grid-template-columns:1fr}.rgw-spec-row:first-child{display:none}.rgw-wheel-copy{padding:0 24px 25px}}\n.rgw-video{position:relative;display:block;overflow:hidden;margin-top:18px;background:#0b2b43}.rgw-video img{display:block;width:100%;aspect-ratio:16\/9;object-fit:cover;filter:brightness(.68)}.rgw-video span{position:absolute;inset:0;display:grid;place-items:center;color:#fff;font-size:16px;font-weight:800;text-align:center}.rgw-video span:before{display:grid;place-items:center;width:64px;height:64px;margin:0 auto 10px;border-radius:50%;background:#e84f2a;content:\"\u25b6\"}<\/style>\n<div class=\"rgw-cmc20\">\n<div class=\"rgw-shell rgw-breadcrumb\"><a href=\"https:\/\/www.railgrindingwheel.com\/railgrinderlibrary\/\">Grinding Trains Library<\/a> \/ GEMAC \/ CMC20<\/div>\n<section class=\"rgw-hero\">\n<div class=\"rgw-shell rgw-hero-grid\">\n<div>\n<div class=\"rgw-brand\">GEMAC \u00b7 SWITCH AND CROSSING GRINDING<\/div>\n<h1>GEMAC CMC20 Rail Grinder<\/h1>\n<p class=\"rgw-answer\">The GEMAC CMC20 is a self-propelled 20-head rail grinder designed for switch and crossing work as well as mainline rail treatment. Published data lists a 2\u201316 km\/h working speed, 90 m minimum grinding radius and grinding-head adjustment from 75\u00b0 gauge side to 45\u00b0 field side.<\/p>\n<p class=\"rgw-review\">Model reference compiled from the existing GEMAC CMC20 technical page and manufacturer-linked data<\/p>\n<div class=\"rgw-actions\"><a class=\"rgw-btn rgw-btn-primary\" href=\"#specifications\">View specifications<\/a><a class=\"rgw-btn rgw-btn-secondary\" href=\"#gallery\">View gallery<\/a><\/div>\n<\/div>\n<figure class=\"rgw-hero-media\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2025\/10\/GEMAC-CMC20-_1-scaled.jpg.webp\" alt=\"GEMAC CMC20 rail grinder for switches and crossings\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 1080px; --smush-placeholder-aspect-ratio: 1080\/608;\" data-smush-webp-fallback=\"{&quot;data-src&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2025\\\/10\\\/GEMAC-CMC20-_1-scaled.jpg&quot;}\"><figcaption>GEMAC CMC20 rail grinding vehicle.<\/figcaption><\/figure>\n<\/div>\n<\/section>\n<div class=\"rgw-shell rgw-facts\">\n<div><small>Grinding heads<\/small><strong>20<\/strong><\/div>\n<div><small>Working speed<\/small><strong>2\u201316 km\/h<\/strong><\/div>\n<div><small>Grinding radius<\/small><strong>90 m minimum<\/strong><\/div>\n<div><small>Track gauge<\/small><strong>1,435 mm<\/strong><\/div>\n<\/div>\n<p><main class=\"rgw-body\"><\/p>\n<div class=\"rgw-shell rgw-layout\">\n<article class=\"rgw-main\">\n<nav class=\"rgw-toc\"><strong>On this page<\/strong><a href=\"#overview\">Overview<\/a><a href=\"#applications\">Applications<\/a><a href=\"#gallery\">Gallery<\/a><a href=\"#video\">Video<\/a><a href=\"#specifications\">Specifications<\/a><a href=\"#grinding-system\">Grinding system<\/a><a href=\"#wheel-reference\">Grinding wheel<\/a><a href=\"#faq\">FAQ<\/a><\/nav>\n<section id=\"overview\" class=\"rgw-section\"><span class=\"rgw-kicker\">Machine overview<\/span><\/p>\n<h2>What is the GEMAC CMC20?<\/h2>\n<p>The CMC20 is a two-car, self-propelled rail grinding vehicle with 20 independently adjustable grinding heads. Its published operating scope emphasizes switch sections, crossings and areas where rail-head and gauge-corner wear require controlled profile restoration.<\/p>\n<p>The machine is listed for 50, 60 and 75 kg\/m rails and for switch references including No. 9, 12, 18, 30 and 38. Exact route approval, rail section and turnout geometry must be confirmed against the operator&#8217;s machine documentation.<\/p>\n<p class=\"rgw-note\"><strong>Short answer:<\/strong> CMC20 is positioned as a switch and crossing grinder that can also perform mainline corrugation removal and rail-profile work. It is not a compact hand-guided profile grinder.<\/p>\n<\/section>\n<section id=\"applications\" class=\"rgw-section\"><span class=\"rgw-kicker\">Published operating scope<\/span><\/p>\n<h2>What work is the CMC20 designed to perform?<\/h2>\n<div class=\"rgw-usecases\">\n<div><strong>Switch and crossing grinding<\/strong><\/p>\n<p>Profile treatment through switch sections, including difficult areas between the switch centre and adjacent rail components.<\/p>\n<\/div>\n<div><strong>Corrugation removal<\/strong><\/p>\n<p>Controlled grinding of wave wear on plain track and within suitable switch alignments.<\/p>\n<\/div>\n<div><strong>Gauge-corner treatment<\/strong><\/p>\n<p>The wide head-angle range supports treatment from the gauge side across the running surface toward the field side.<\/p>\n<\/div>\n<div><strong>Rail-profile restoration<\/strong><\/p>\n<p>Multiple heads distribute the grinding pattern to restore a smoother transverse profile and surface finish.<\/p>\n<\/div>\n<\/div>\n<p>Published benefits include reduced dynamic impact through switch sections and improved running stability after profile restoration. Actual results depend on initial rail condition, removal target, head arrangement and number of passes.<\/p>\n<\/section>\n<section id=\"gallery\" class=\"rgw-section\"><span class=\"rgw-kicker\">Machine photographs<\/span><\/p>\n<h2>GEMAC CMC20 gallery<\/h2>\n<div class=\"rgw-gallery\"><a href=\"https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2025\/10\/GEMAC-CMC20-_1-scaled.jpg.webp\" data-smush-webp-fallback=\"{&quot;href&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2025\\\/10\\\/GEMAC-CMC20-_1-scaled.jpg&quot;}\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/smush-webp\/2025\/10\/GEMAC-CMC20-_1-scaled.jpg.webp\" alt=\"GEMAC CMC20 rail grinding vehicle\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 1080px; --smush-placeholder-aspect-ratio: 1080\/608;\" data-smush-webp-fallback=\"{&quot;data-src&quot;:&quot;https:\\\/\\\/www.railgrindingwheel.com\\\/wp-content\\\/uploads\\\/2025\\\/10\\\/GEMAC-CMC20-_1-scaled.jpg&quot;}\"><\/a><a href=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_2.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_2.jpg\" alt=\"GEMAC CMC20 side view\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 1080px; --smush-placeholder-aspect-ratio: 1080\/719;\"><\/a><a href=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_3.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_3.jpg\" alt=\"GEMAC CMC20 rail grinder operating reference\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 1080px; --smush-placeholder-aspect-ratio: 1080\/720;\"><\/a><a href=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_4.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_4.jpg\" alt=\"GEMAC CMC20 grinding equipment\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 1080px; --smush-placeholder-aspect-ratio: 1080\/701;\"><\/a><a href=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_5.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_5.jpg\" alt=\"GEMAC CMC20 machine detail\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 1080px; --smush-placeholder-aspect-ratio: 1080\/810;\"><\/a><a href=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_6.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_6.jpg\" alt=\"GEMAC CMC20 switch grinding reference\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 400px; --smush-placeholder-aspect-ratio: 400\/280;\"><\/a><a href=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_7.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2025\/10\/GEMAC-CMC20-_7.jpg\" alt=\"GEMAC CMC20 rail grinding train\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 546px; --smush-placeholder-aspect-ratio: 546\/296;\"><\/a><\/div>\n<\/section>\n<section id=\"video\" class=\"rgw-section\"><span class=\"rgw-kicker\">Machine video<\/span><\/p>\n<h2>GEMAC CMC20 operating video<\/h2>\n<p>The original model-page video is retained as a visual reference for the CMC20 machine and grinding arrangement. Fleet equipment and working configurations may differ.<\/p>\n<p><a class=\"rgw-video\" href=\"https:\/\/www.youtube.com\/watch?v=PB4BkXwcX_0\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" data-src=\"https:\/\/img.youtube.com\/vi\/PB4BkXwcX_0\/maxresdefault.jpg\" alt=\"GEMAC CMC20 rail grinder video\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\"><span>Watch GEMAC CMC20 video<\/span><\/a><\/section>\n<section id=\"specifications\" class=\"rgw-section\"><span class=\"rgw-kicker\">Published machine data<\/span><\/p>\n<h2>GEMAC CMC20 specifications<\/h2>\n<div class=\"rgw-spec\">\n<div class=\"rgw-spec-row\"><span>Specification<\/span><span>Published value<\/span><span>Qualification<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Track gauge<\/b><span>1,435 mm<\/span><span>Standard-gauge configuration<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Grinding heads<\/b><span>20<\/span><span>Adjustable grinding positions<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Working speed<\/b><span>2\u201316 km\/h<\/span><span>Stable working-transfer range<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Working-speed accuracy<\/b><span>\u00b10.5 km\/h<\/span><span>Published control accuracy<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Maximum coupled speed<\/b><span>120 km\/h<\/span><span>In train formation<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Bidirectional self-propelled speed<\/b><span>At least 80 km\/h<\/span><span>Published maximum reference<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Minimum traversable curve<\/b><span>65 m<\/span><span>Travel configuration<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Minimum grinding curve<\/b><span>90 m<\/span><span>Working configuration<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Maximum gradient<\/b><span>40\u2030<\/span><span>Published value<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Maximum superelevation<\/b><span>175 mm<\/span><span>Published value<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Maximum axle load<\/b><span>14 t<\/span><span>Published upper limit<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Ambient temperature<\/b><span>\u221220 to +50 \u00b0C<\/span><span>Published operating envelope<\/span><\/div>\n<div class=\"rgw-spec-row\"><b>Maximum altitude<\/b><span>2,000 m<\/span><span>Published upper limit<\/span><\/div>\n<\/div>\n<\/section>\n<section id=\"grinding-system\" class=\"rgw-section\"><span class=\"rgw-kicker\">Head positioning and consist<\/span><\/p>\n<h2>How is the CMC20 grinding system configured?<\/h2>\n<div class=\"rgw-process\">\n<div><strong>20 grinding heads<\/strong><\/p>\n<p>The multi-head arrangement distributes work across the rail profile and allows different angular positions to be combined.<\/p>\n<\/div>\n<div><strong>Wide angular range<\/strong><\/p>\n<p>Published head adjustment extends from 75\u00b0 on the gauge side to 45\u00b0 on the field side, with \u00b10.5\u00b0 positioning accuracy.<\/p>\n<\/div>\n<div><strong>Two-car connection<\/strong><\/p>\n<p>13B couplers are listed at both ends, with an MJGH-25T tight-lock coupler and buffer arrangement between the cars.<\/p>\n<\/div>\n<div><strong>Stable low-speed travel<\/strong><\/p>\n<p>The specified 2\u201316 km\/h working range supports controlled passes through complex switch geometry.<\/p>\n<\/div>\n<\/div>\n<\/section>\n<section id=\"wheel-reference\" class=\"rgw-wheel\">\n<header class=\"rgw-wheel-intro\"><span class=\"rgw-kicker\">Grinding wheel reference<\/span><\/p>\n<h2>152 \u00d7 80 \u00d7 M20 rail grinding wheel<\/h2>\n<p>The CMC20 uses the same referenced wheel specification as the Harsco RGH20C: a 152 \u00d7 80 mm resin-bonded rail grinding wheel with an M20 internal thread. Confirm the installed grinding head and wheel marking before ordering.<\/p>\n<\/header>\n<div class=\"rgw-wheel-body\">\n<figure class=\"rgw-wheel-photo\"><img decoding=\"async\" data-src=\"https:\/\/www.railgrindingwheel.com\/wp-content\/uploads\/2026\/09\/harsco-rgh20c-152x80xm20-grinding-wheel.png\" alt=\"152 x 80 x M20 rail grinding wheel for GEMAC CMC20\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" class=\"lazyload\" style=\"--smush-placeholder-width: 811px; --smush-placeholder-aspect-ratio: 811\/1080;\"><\/figure>\n<div class=\"rgw-wheel-copy\">\n<dl class=\"rgw-wheel-specs\">\n<div>\n<dt>Outside diameter<\/dt>\n<dd>152 mm<\/dd>\n<\/div>\n<div>\n<dt>Thickness<\/dt>\n<dd>80 mm<\/dd>\n<\/div>\n<div>\n<dt>Mounting<\/dt>\n<dd>M20 internal thread<\/dd>\n<\/div>\n<div>\n<dt>Bond<\/dt>\n<dd>Resin bond<\/dd>\n<\/div>\n<div>\n<dt>Maximum speed<\/dt>\n<dd>50 m\/s<\/dd>\n<\/div>\n<div>\n<dt>Referenced machines<\/dt>\n<dd>CMC20 \/ RGH20C<\/dd>\n<\/div>\n<\/dl>\n<p class=\"rgw-caution\"><strong>Compatibility check required:<\/strong> M20 and 5\/8-11 are different thread systems and are not interchangeable. Confirm the installed head, thread direction and engagement, wheel marking, maximum RPM and operator-approved drawing.<\/p>\n<div class=\"rgw-actions\"><a class=\"rgw-btn rgw-btn-primary\" href=\"https:\/\/www.railgrindingwheel.com\/rail-grinding-train-wheel\/152x80xm20\/\">View 152 \u00d7 80 \u00d7 M20 wheel \u2192<\/a><a class=\"rgw-btn rgw-btn-secondary\" href=\"https:\/\/www.railgrindingwheel.com\/contactus\/\">Request specification review<\/a><\/div>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"rgw-section\"><span class=\"rgw-kicker\">Ordering checklist<\/span><\/p>\n<h2>What should buyers confirm before ordering?<\/h2>\n<div class=\"rgw-checklist\">\n<div>01 \u00b7 CMC20 machine serial number and configuration<\/div>\n<div>02 \u00b7 Existing wheel marking and photographs<\/div>\n<div>03 \u00b7 152 \u00d7 80 mm dimensional confirmation<\/div>\n<div>04 \u00b7 M20 thread direction, pitch and engagement<\/div>\n<div>05 \u00b7 Approved RPM or 50 m\/s speed confirmation<\/div>\n<div>06 \u00b7 Rail section and treatment objective<\/div>\n<\/div>\n<\/section>\n<section id=\"faq\" class=\"rgw-section rgw-faq\"><span class=\"rgw-kicker\">Technical questions<\/span><\/p>\n<h2>GEMAC CMC20 FAQ<\/h2>\n<details>\n<summary>What is the GEMAC CMC20?<\/summary>\n<p>It is a self-propelled 20-head rail grinder designed primarily for switch, crossing and rail-profile treatment.<\/p>\n<\/details>\n<details>\n<summary>How many grinding heads does the CMC20 use?<\/summary>\n<p>The published configuration has 20 grinding heads.<\/p>\n<\/details>\n<details>\n<summary>What is the CMC20 working speed?<\/summary>\n<p>The listed working-transfer range is 2\u201316 km\/h, with published speed-control accuracy of \u00b10.5 km\/h.<\/p>\n<\/details>\n<details>\n<summary>What is the minimum grinding curve radius?<\/summary>\n<p>The published minimum radius in grinding mode is 90 m; the minimum traversable curve is 65 m.<\/p>\n<\/details>\n<details>\n<summary>Can the CMC20 grind switches?<\/summary>\n<p>Yes. Switch and crossing treatment is a primary published application of the machine.<\/p>\n<\/details>\n<details>\n<summary>Which rail sections are listed?<\/summary>\n<p>The existing technical information lists 50, 60 and 75 kg\/m rail references.<\/p>\n<\/details>\n<details>\n<summary>What grinding-head angle range is available?<\/summary>\n<p>The published range is 75\u00b0 on the gauge side to 45\u00b0 on the field side, with \u00b10.5\u00b0 adjustment accuracy.<\/p>\n<\/details>\n<details>\n<summary>Which grinding wheel fits the CMC20?<\/summary>\n<p>The referenced specification is 152 \u00d7 80 \u00d7 M20, resin bonded, with a published maximum speed of 50 m\/s. Confirm the installed head, M20 thread and approved drawing before ordering.<\/p>\n<\/details>\n<\/section>\n<section class=\"rgw-references\">\n<h2>Sources and review notes<\/h2>\n<ol>\n<li><a href=\"https:\/\/gemac-cn.com\/\">GEMAC official website<\/a>.<\/li>\n<li><a href=\"https:\/\/www.gemac-cn.com\/cn\/products\/123\">GEMAC CMC20 product reference<\/a>.<\/li>\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=PB4BkXwcX_0\">GEMAC CMC20 video reference<\/a>.<\/li>\n<li><a href=\"https:\/\/www.railgrindingwheel.com\/rail-grinding-train-wheel\/152x80xm20\/\">152 \u00d7 80 \u00d7 M20 grinding wheel<\/a> \u2014 referenced wheel specification and enquiry information.<\/li>\n<\/ol>\n<p>Layout review: 17 September 2026. Existing published machine parameters and photographs were retained. Grinding-wheel compatibility remains unverified.<\/p>\n<\/section>\n<\/article>\n<aside class=\"rgw-aside\">\n<div class=\"rgw-info\">\n<div class=\"rgw-info-head\"><strong>GEMAC CMC20<\/strong><\/div>\n<dl>\n<div>\n<dt>Manufacturer<\/dt>\n<dd>GEMAC<\/dd>\n<\/div>\n<div>\n<dt>Machine type<\/dt>\n<dd>Rail grinder<\/dd>\n<\/div>\n<div>\n<dt>Primary work<\/dt>\n<dd>Switches \/ crossings<\/dd>\n<\/div>\n<div>\n<dt>Grinding heads<\/dt>\n<dd>20<\/dd>\n<\/div>\n<div>\n<dt>Working speed<\/dt>\n<dd>2\u201316 km\/h<\/dd>\n<\/div>\n<div>\n<dt>Track gauge<\/dt>\n<dd>1,435 mm<\/dd>\n<\/div>\n<\/dl>\n<p><a class=\"rgw-official\" href=\"https:\/\/gemac-cn.com\/\">Official GEMAC website \u2192<\/a><\/div>\n<div class=\"rgw-rfq\"><span class=\"rgw-kicker\">Wheel identification<\/span><\/p>\n<h3>Need to identify a CMC20 wheel?<\/h3>\n<p>Send the wheel marking, 152 \u00d7 80 \u00d7 M20 confirmation, thread details, maximum RPM, machine configuration and required quantity.<\/p>\n<p><a class=\"rgw-btn\" href=\"https:\/\/www.railgrindingwheel.com\/contactus\/\">Send technical details \u2192<\/a><\/div>\n<\/aside>\n<\/div>\n<p><\/main><\/p>\n<section class=\"rgw-related\">\n<div class=\"rgw-shell\"><span class=\"rgw-kicker\">Related references<\/span><\/p>\n<h2>Continue exploring<\/h2>\n<div class=\"rgw-related-grid\"><a href=\"https:\/\/www.railgrindingwheel.com\/railway-maintenance-equipment-types-and-functions\/\"><small>Equipment guide<\/small><strong>Railway maintenance equipment<\/strong><span>Compare maintenance-machine categories and functions.<\/span><\/a><a href=\"https:\/\/www.railgrindingwheel.com\/rail-grinding-train-wheel\/152x80xm20\/\"><small>Grinding wheel<\/small><strong>152 \u00d7 80 \u00d7 M20<\/strong><span>Review the referenced CMC20 wheel specification.<\/span><\/a><a class=\"rgw-library\" href=\"https:\/\/www.railgrindingwheel.com\/railgrinderlibrary\/\"><small>Model encyclopedia<\/small><strong>Grinding Trains Library<\/strong><span>Return to the complete model index.<\/span><\/a><\/div>\n<\/div>\n<\/section>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@graph\": [{\"@type\": \"WebPage\", \"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/\", \"mainEntity\": {\"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/#article\"}}, {\"@type\": \"TechArticle\", \"headline\": \"GEMAC CMC20 Rail Grinder\", \"description\": \"Technical overview of the GEMAC CMC20 20-head rail grinder for switches, crossings and rail-profile treatment.\", \"dateModified\": \"2026-10-29\", \"mainEntityOfPage\": {\"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/\"}, \"about\": {\"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/#machine\"}, \"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/#article\", \"author\": {\"@id\": \"https:\/\/www.railgrindingwheel.com\/#organization\"}, \"publisher\": {\"@id\": \"https:\/\/www.railgrindingwheel.com\/#organization\"}, \"datePublished\": \"2025-10-16T02:47:08+00:00\", \"image\": {\"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/#primaryimage\"}}, {\"@type\": \"Thing\", \"name\": \"GEMAC CMC20\", \"description\": \"Rail grinding vehicle for switch, crossing and mainline profile treatment.; manufacturer: GEMAC; vehicleConfiguration: Self-propelled 20-head rail grinding vehicle\", \"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/#machine\"}, {\"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the GEMAC CMC20?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A self-propelled 20-head rail grinder for switch, crossing and rail-profile treatment.\"}}, {\"@type\": \"Question\", \"name\": \"What is the CMC20 working speed?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The published working-transfer range is 2\u201316 km\/h.\"}}, {\"@type\": \"Question\", \"name\": \"What is the minimum grinding curve radius?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The published minimum grinding radius is 90 m.\"}}, {\"@type\": \"Question\", \"name\": \"Which grinding wheel fits the CMC20?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The referenced specification is 152 \u00d7 80 \u00d7 M20 with a resin bond and 50 m\/s maximum speed; installed head and thread details must still be confirmed.\"}}], \"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/#faq\", \"isPartOf\": {\"@id\": \"https:\/\/www.railgrindingwheel.com\/gemac-cmc20\/\"}}]}<\/script><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Grinding Trains Library \/ GEMAC \/ CMC20 GEMAC \u00b7 SWITCH AND CROSSING GRINDING GEMAC CMC20 Rail Grinder The GEMAC CMC20 is a self-propelled 20-head rail grinder designed for switch and crossing work as well as mainline rail treatment. Published data lists a 2\u201316 km\/h working speed, 90 m minimum grinding radius and grinding-head adjustment from [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1898,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"no-sidebar","site-content-layout":"page-builder","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","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 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