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Rolling Stock

​The term rolling stock in the rail transport industry refers to railway vehicles, including both powered and unpowered vehicles: for example, locomotives, freight and passenger cars (or coaches), and non-revenue cars. Passenger vehicles can be un-powered, or self-propelled, single or multiple units.

In North America, Australia and other countries, the term consist (/ˈkɒnsɪst/ KON-sist) is used to refer to the rolling stock in a train.[5]: 1‑129 

In the United States, the term rolling stock has been expanded from the older broadly defined "trains" to include wheeled vehicles used by businesses on roadways.[6][7][8]

The word stock in the term is 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.[9][10] 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.