1.
freight car; cargo vehicle
A vehicle used for transporting goods and cargo, whether a railway freight car or a road vehicle.
A compound of 貨物 (freight, cargo) and 車 (vehicle, car). Can refer to either a railway freight car or a road vehicle used for hauling goods.
In the railway context, 貨物車 specifically refers to individual freight cars as distinct from 貨物列車 (freight train), which is the entire train. On roads, it refers to trucks and other cargo-carrying vehicles.