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Rolling Stock

The term 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, and coaches.

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.

A hopper car at the Pilgrim's Pride feed mill in Pittsburg, Texas.

By Michael Barera, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=42012742

A hopper car at the Pilgrim's Pride feed mill in Pittsburg, Texas.