rolling stock in rail transport industry refers to any vehicles that move on a railway. It usually includes both powered and unpowered vehicles, for example locomotives, railroad cars, coaches, and wagons    . In the  US, the definition has been expanded to include the wheeled vehicles used by businesses on roadways   .
Note that stock in the term is business related and used in a sense of
inventory. Rolling stock is considered to be a liquid asset, or close to it, since the value of the vehicle can be readily estimated and then shipped to the buyer without much cost or delay. 
The term contrasts with fixed stock (
infrastructure), which is a collective term for the track, signals, stations, other buildings, electric wires, etc., necessary to operate a railway.
Great Britain, types of rolling stock were given code names, often of animals. For example, "Toad" was used as a code name for the Great Western Railway goods brake van, while  British Railways wagons used for track maintenance were named after fish, such as "Dogfish" for a ballast hopper. These codes were  telegraphese, somewhat analogous to the SMS language of today.
See also References
"Yaxham Light Railway rolling stock page".
"Definition of "rolling stock" from the Oxford English Dictionary accessed 5 February 2007 (subscription service)".
"Definition of "rolling stock" from the Concise Oxford Dictionary".
"Definition from the American Heritage Dictionary". Archived from the original on 2009-02-22.
"rolling stock". The Free Dictionary. Farlex . Retrieved . January 27, 2017
Illinois Department of Revenue. "RUT-7: Rolling Stock Certification" (PDF) . Retrieved . January 27, 2017
"Michigan's Rolling Stock Exemption". TaxRates. Avalara . Retrieved . January 27, 2017
Finger, Matthias; Bert, Nadia; Kupfer, David, eds. (2014). "Rail infrastructure and rolling stock: investments, asset renewal and regulation" (PDF). European University Institute, Florence School of Regulation. pp. 8–9.
Wijnia, Y.; de Croon, J.; Liyanage, J.P. (2014). "36: Application of a Unified Reference Model Across Asset Types: Comparative Cases". In Lee, Jay; Ni, Jun; Sarangapani, Jagnathan; Mathew, Joseph (eds.). . London: Springer. pp. 416–417. Engineering Asset Management 2011: Proceedings of the Sixth World Congress on Engineering Asset Management ISBN 978-1-4471-4993-4. ISSN 2195-4356. LCCN 2013934026 – via Google Books.
"Code Names for Great Western Carriage Stock and Vans". greatwestern.org.uk.
"Fishkinds and TOPS". btinternet.com. Archived from the original on 11 October 2012. External links
Media related to rail vehicles at Wikimedia Commons
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