James is a mixed-traffic tender engine who works on the North Western Railway, usually working along the Main Line. He can be vain, boastful, and overconfident but means well and is a hard worker.
A secret crew of LAPD comes together under the leadership of John O'Mara (James), a former World War II soldier, to tear down the world of one of the most dangerous gangsters, Mickey Cohen (Diesel), who runs the city.