locomotive

noun

1. The power unit of a train that pulls the coaches or wagons.

   “As on all other British Railways standard locomotives to date, the lubrication of motion pins and reversing gear is by grease nipple and gun.”

2. (rare)A traction engine.
3. (slang)A cheer characterized by a slow beginning and a progressive increase in speed.
4. (archaic)Any of various early road vehicles, steam-powered, etc., forerunners of the modern car.
5. A country which drives the world economy by having a high level of imports, such as the United States.

adj

1. Of or relating to locomotion.
2. Of or relating to the power unit of a train which does not carry passengers or freight itself.
3. Moving, or capable of motion.

   “Pindar seems to imply that these figures were actually locomotive automata.”