Cabin car and Railroad car

Cabin car noun - A car on a freight train for use of the train crew; usually the last car on the train.

Railroad car and cabin car are semantically related. In some cases you can use "Railroad car" instead a noun phrase "Cabin car".

Railroad car noun - A wheeled vehicle adapted to the rails of railroad.

Cabin car and railroad car are semantically related. Sometimes you can replace phrase "Cabin car" with "Railroad car", this phrases are similar.