Turbojet train

A turbojet train is a train powered by turbojet engines. Like a jet aircraft, but unlike a gas turbine locomotive, the train is propelled by the jet thrust of the engines, rather than by its wheels. Only a handful of jet-powered trains have been built, for experimental research in high-speed rail.

ER22 turbojet train

Turbojet engines have been built with the engine incorporated into a railcar combining both propulsion and passenger accommodation rather than as separate locomotives hauling passenger coaches.

As turbojet engines are most efficient at high speeds[note 1], the experimental research has focused in applications for high-speed passenger services, rather than the heavier trains (with more frequent stops) used for freight services.

M-497Edit

The first attempt to use turbojet engines on a railroad was made in 1966 by the New York Central Railroad (NYCR), a company with operations throughout the Great Lakes region. They streamlined a Budd Rail Diesel Car, added two General Electric J47-19 jet engines, and nicknamed it the M-497 Black Beetle. Testing was performed on a 25 mi (40 km) length of the normal NYCR system – a virtually arrow-straight layout of regular existing track between Butler, Indiana, and Stryker, Ohio.

On July 23, 1966, the train reached a speed of 184 miles per hour (296 km/h).[1][2]

LIMRVEdit

 
LIMRV before J52 jet engines were added

In the early 1970s, the U.S. Federal Railroad Administration developed the Linear Induction Motor Research Vehicle (LIMRV), meant to test the use of linear induction motors. The LIMRV was a specialized wheeled vehicle, running on standard-gauge railroad track. Speed was limited due to the 6.4 mi (10.3 km) length of the track and vehicle acceleration rates.

One stage of research saw the addition of two Pratt & Whitney J52 jet engines to propel the LIMRV. Once the LIMRV had accelerated to desired velocity, the engines were throttled back so that the thrust equaled their drag. On 14 August 1974, using the jet engines, the LIMRV achieved a world record speed of 255.7 mph (411.5 km/h) for vehicles on conventional rail.[3][4][5]

SVLEdit

 
Monument at the rail-car factory in Tver depicting a Turbojet train

In 1970, researchers in the USSR developed the High-speed Laboratory Railcar (SVL) turbojet train.[6] The SVL was able to reach a speed of 250 kilometres per hour (160 mph).[7][8] The researchers placed jet engines on an ER22 railcar, normally part of an electric-powered multiple unit train. The SVL had a mass of 54.4 tonnes (including 7.4 tonnes of fuel) and was 28 metres (92 ft) long. If the research had been successful, there was a plan to use the turbojet powered vehicle to pull a "Russian troika" express service.[7] As of 2014 the train still exists in a dilapidated and unmaintained state, while the research project has been honoured with a monument made from the front of the railcar, outside a railcar factory in Tver, a city in western Russia.[9]

See alsoEdit

NotesEdit

  1. ^ Their efficiency increases as vehicle speed increases to the speed of the exhaust jet, although this is considerably more than railway speeds.

ReferencesEdit

  1. ^ "It's a Jet! It's a Train! It's M-497". Dark Roasted Blend: Weird and Wonderful Things. 2007-01-12. Retrieved 2008-03-21.
  2. ^ Wojdyla, Ben (2008-02-21). "Retro: New York Central's M-497 Jet Powered Train". Jalopnik.com. Retrieved 2008-03-21.
  3. ^ Johnson, R. D. (1988). "Thoughts at 160 mph". Proceedings of the American Railway Engineering Association. 89: 330–331. Retrieved 2010-09-11.
  4. ^ Reiff, Glenn A. (1973). "New Capabilities in Railroad Testing". Proceedings of the American Railway Engineering Association. 74: 1–10. Retrieved 2010-09-11.
  5. ^ "The Rohr Aerotrain Tracked Air-Cushion Vehicle (TACV)". SHONNER Studios. Retrieved 2010-08-28.
  6. ^ "Турбореактивный вагон СВЛ (Turbojet engine SVL)" (in Russian). Archived from the original on 2007-12-09. Retrieved 2008-04-08.
  7. ^ a b "Flying on rails". Pravda. 1972-03-17. Archived from the original on 2006-07-01.
  8. ^ "Soviet Jet Train. Some More History". English Russia. 23 May 2007.
  9. ^ "Abandoned and Rusty Soviet Turbo Jet Train". English Russia. 26 May 2014.

External linksEdit