(US) Any railway vehicle or rolling stock.

(historical) The Pre-American Civil War anti-slavery resistance movement dedicated to assisting escaped slaves in reaching safe territory.

(rail transport, US) A heavy, preserved piece of hewn timber laid crossways to and supporting the rails of a railroad or a member of similar shape and function of another material such as concrete.

(rail transport, US) A pair of formed steel rails, separated and supported usually on wooden or concrete ties or sleepers, forming a track along which flange-wheeled railroad vehicles may travel.

(US) A chassis or framework-like structure underneath a railroad car to which wheel axles (and, hence, wheels) are attached through bearings. (Not to be confused with railway truck or railtruck, which are British English synonyms of railroad car)

(US) A place where trains stop for passengers to embark and disembark.

plural of railroad station

(US) An area on a road where a train crosses.

a railway gun

plural of railroad track / The railroad network, used with the definite article (“the railroad tracks”).