49 USC 20301 - Definition and nonapplication

(a) Definition.— 
In this chapter, vehicle means a car, locomotive, tender, or similar vehicle.
(b) Nonapplication.— 
This chapter does not apply to the following:
(1) a train of 4-wheel coal cars.
(2) a train of 8-wheel standard logging cars if the height of each car from the top of the rail to the center of the coupling is not more than 25 inches.

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(3) a locomotive used in hauling a train referred to in clause (2) of this subsection when the locomotive and cars of the train are used only to transport logs.
(4) a car, locomotive, or train used on a street railway.