{"id":658011,"date":"2026-05-15T12:00:00","date_gmt":"2026-05-15T10:00:00","guid":{"rendered":"https:\/\/migflug.com\/jetflights\/?p=658011"},"modified":"2026-05-22T15:49:55","modified_gmt":"2026-05-22T13:49:55","slug":"the-soviet-jet-train-when-engineers-bolted-a-yak-40-engine-to-a-railcar","status":"publish","type":"post","link":"https:\/\/migflug.com\/jetflights\/the-soviet-jet-train-when-engineers-bolted-a-yak-40-engine-to-a-railcar\/","title":{"rendered":"The Soviet Jet Train: When Engineers Bolted a Yak-40 Engine to a Railcar"},"content":{"rendered":"<style>.et_pb_title_container h1.entry-title { padding-top: 40px !important; }<\/style>\n\nIn 1970, Soviet engineers took a standard ER22 railway carriage, bolted two jet engines from a Yakovlev Yak-40 airliner to the roof, and sent it screaming down the tracks at 250 kilometres per hour. This was not a fever dream. This was Soviet transport policy.\n\nThe SVL \u2014 Skorostnoy Vagon-Laboratoriya, or High-Speed Laboratory Car \u2014 was the Soviet Union&#8217;s attempt to answer a question that Western nations were also asking: could jet propulsion make trains fast enough to compete with aircraft on short-haul routes?\n\n\n<div style=\"background:#f0f4ff;border-left:4px solid #5C91FF;padding:18px 22px;margin:24px 0 28px;border-radius:0 8px 8px 0\">\n<p style=\"margin:0 0 10px;font-weight:700;color:#333;font-size:17px\">Quick Facts<\/p>\n<p style=\"margin:4px 0\"><strong>Vehicle:<\/strong> SVL (Skorostnoy Vagon-Laboratoriya) \u2014 High-Speed Laboratory Car<\/p>\n<p style=\"margin:4px 0\"><strong>Built:<\/strong> 1970, Soviet Union<\/p>\n<p style=\"margin:4px 0\"><strong>Base vehicle:<\/strong> ER22 railway carriage<\/p>\n<p style=\"margin:4px 0\"><strong>Engines:<\/strong> 2\u00d7 Ivchenko AI-25 turbofans (from Yak-40 airliner)<\/p>\n<p style=\"margin:4px 0\"><strong>Top speed:<\/strong> ~250 km\/h during testing<\/p>\n<p style=\"margin:4px 0\"><strong>Purpose:<\/strong> Research into high-speed rail dynamics and aerodynamics<\/p>\n<\/div>\n\n\n<h2 style=\"padding-top:22px\">Aviation Engines on Rails<\/h2>\n\nThe concept was straightforward, even if the execution was audacious. The SVL used its wheels only for guidance and support \u2014 not for propulsion. All forward thrust came from the two Ivchenko AI-25 turbofan engines mounted on the roof, the same engines that powered the Yak-40 regional airliner. The railway carriage simply rode the rails while the jet engines pushed it forward, like strapping a rocket to a shopping trolley.\n\nThe AI-25 engines were relatively small and efficient by jet standards \u2014 each produced about 1,500 kilograms of thrust \u2014 but on a vehicle with steel wheels on smooth rails, that was more than enough. Friction was minimal. Aerodynamic drag was the primary limiting factor, and at 250 km\/h, it became significant.\n\n<h2 style=\"padding-top:22px\">What They Learned<\/h2>\n\nThe SVL was never intended to become a production vehicle. It was a research platform \u2014 a moving laboratory designed to gather data on high-speed rail dynamics that the Soviet Union could not obtain any other way. At 250 km\/h, phenomena like rail oscillation, wheel-rail contact dynamics, aerodynamic buffeting, and braking behaviour were fundamentally different from anything encountered at conventional speeds.\n\nSoviet engineers instrumented the carriage with sensors measuring every conceivable parameter: lateral acceleration, vertical bounce, yaw rate, air pressure distribution, noise levels, and structural stress. The data fed into the development of future high-speed rail concepts and helped Soviet railway engineers understand the limits of their existing track infrastructure.\n\n<h2 style=\"padding-top:22px\">The Jet Train That Time Forgot<\/h2>\n\nThe SVL was not alone in the jet-train concept. The United States experimented with the M-497 Black Beetle in 1966 \u2014 a modified Budd Rail Diesel Car with two General Electric J47 jet engines from a B-36 bomber strapped to the roof. It reached 295 km\/h on a test track in Ohio. France, Germany, and Japan were all pursuing high-speed rail through more conventional means, and their approaches \u2014 electric traction, purpose-built track, aerodynamic trainsets \u2014 ultimately won.\n\nThe SVL sits today as a rusting relic, a monument to an era when Soviet engineers believed that any problem could be solved by bolting a jet engine to it. They were not always wrong. But the future of high-speed rail belonged to the TGV, the Shinkansen, and the ICE \u2014 not to jet engines on the roof of a railway carriage.\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube\"><div class=\"wp-block-embed__wrapper\">\n<iframe hcb-fetch-image-from=\"https:\/\/www.youtube.com\/watch?v=toxBr2IyOv0\" title=\"The Forgotten Soviet Rocket Streamliner Too Advanced For Its Own Era\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/toxBr2IyOv0?feature=oembed\"  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>The forgotten Soviet rocket streamliner \u2014 too advanced for its era<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube\"><div class=\"wp-block-embed__wrapper\">\n<iframe hcb-fetch-image-from=\"https:\/\/www.youtube.com\/watch?v=e713jlnQVeg\" title=\"The Jet Engine trains that weren&#039;t built for speed - TurboJet Trains\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/e713jlnQVeg?feature=oembed\"  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption>The turbojet trains that were not built for speed<\/figcaption><\/figure>\n\n\n<em>Sources: Archived Dreams (Instagram), Soviet railway engineering archives<\/em>","protected":false},"excerpt":{"rendered":"<p>In 1970, Soviet engineers took a standard ER22 railway carriage, bolted two jet engines from a Yakovlev Yak-40 airliner to the roof, and sent it screaming down the tracks at 250 kilometres per hour. This was not a fever dream. This was Soviet transport policy. The SVL \u2014 Skorostnoy Vagon-Laboratoriya, or High-Speed Laboratory Car \u2014 [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":658007,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"soviet jet train","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","editor_notices":[],"footnotes":""},"categories":[666],"tags":[],"class_list":["post-658011","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-history-and-legends"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Soviet Jet Train: When Engineers Bolted a Yak-40 Engine to a Railcar | MiGFlug.com Blog<\/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:\/\/migflug.com\/jetflights\/the-soviet-jet-train-when-engineers-bolted-a-yak-40-engine-to-a-railcar\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Soviet Jet Train: When Engineers Bolted a Yak-40 Engine to a Railcar | MiGFlug.com Blog\" \/>\n<meta property=\"og:description\" content=\"In 1970, Soviet engineers took a standard ER22 railway carriage, bolted two jet engines from a Yakovlev Yak-40 airliner to the roof, and sent it screaming down the tracks at 250 kilometres per hour. 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