49 U.S.C. § 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.
(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.
( Pub. L. 103–272, § 1(e) , July 5, 1994 , 108 Stat. 881 ; Pub. L. 104–287, § 5(52) , Oct. 11, 1996 , 110 Stat. 3393 .)