Railway locomotive and Self-propelled vehicle

Railway locomotive noun - A wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks.

Self-propelled vehicle and railway locomotive are semantically related. In some cases you can use "Self-propelled vehicle" instead a noun phrase "Railway locomotive".

Self-propelled vehicle noun - A wheeled vehicle that carries in itself a means of propulsion.

Railway locomotive and self-propelled vehicle are semantically related. Sometimes you can replace phrase "Railway locomotive" with "Self-propelled vehicle", this phrases are similar.