Engine number may refer to an identification number marked on the engine of a vehicle or, in the case of locomotives, to the road number of the locomotive. The engine number is separate from the Vehicle Identification Number (VIN).
Every vehicle engine is marked with an engine number by the factory. The engine number includes coded information, which can be decoded to reveal information such as year of manufacture, country of manufacture, and engine type.
The term is also used in train terminology. In this instance, it refers to the road number assigned to motive power by the operator, as opposed to a constructor's or builder's number (equivalent to a vehicle VIN number).
- Clymer Repair Manuals (1991). Small Diesel Engine Service Manual, Edition 3. Intertec Publishing Corporation, Primedia Business Directories & Books, Intertec Publishing. p. 113. ISBN 978-0-87288-448-9.
- Seume, Keich (1996). Aircooled VW Engine Interchange Manual: The User's Guide to Original and Aftermarket Parts... MotorBooks/MBI Publishing Company. p. 11. ISBN 978-0-7603-0314-6.
- "Engine Number Guide" (PDF). Perkins Engines Company Limited. 2009.
- Brotherhood of Locomotive Firemen and Enginemen's magazine, Volume 60. 1916. pp. 428, 435. Retrieved 2009-09-11.
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