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Train wheel

Not to be confused with Training wheels.

Both wheels of a wheelset rotate at the same rate because the wheels are fixed rigidly on the axle

A train wheel or rail wheel is a type of wheel specially designed for use on railway tracks. The wheel acts as a rolling component, typically press fitted on to an axle and mounted directly on a railway carriage or locomotive, or indirectly on a bogie (BrE) or truck (NAmE). The powered wheels under the locomotive are called driving wheels. Wheels are initially cast or forged and then heat-treated to have a specific hardness.[1] New wheels are machined using a lathe to a standardised shape, called a profile. All wheel profiles are regularly checked to ensure proper interaction between the wheel and the rail.[citation needed] Incorrectly profiled wheels and worn wheels can increase rolling resistance, reduce energy efficiency and may even cause a derailment.[2] The International Union of Railways has defined a standard wheel diameter of 920 mm (36 in), although smaller sizes are used in some rapid transit railway systems and on ro-ro carriages.[3]

  1. ^ Lewis, R.; Olofsson, U. (25 September 2009). Wheel–Rail Interface Handbook. Elsevier Science. ISBN 9781845694128. Retrieved 29 October 2020.
  2. ^ Lewis, Roger; Olofsson, Ulf (2009). Wheel-rail interface handbook. Boca Raton, Florida: CRC Press. ISBN 978-1-61583-153-1. OCLC 500906475.
  3. ^ Licitra, Gaetano (6 September 2012). Noise Mapping in the EU: Models and Procedures. CRC Press. ISBN 978-0-203-84812-8.

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