Train:

• A. One or more LRVs, Engines and/or cars, coupled together, operating on the mainline and displaying headlights to the front and red light(s) to the rear.
• B. A single motor car with no rear lights.
• C. Any rolling stock in yards only.
• D. A signal device that controls train movements.

Answer: (A)

A train is defined as one or more rail vehicles (LRVs, engines, and/or cars) that are coupled together and move as a unit on the mainline, with headlights at the front and red lights at the rear. This setup ensures visibility and signaling: the front headlights show the train’s presence and direction, while the rear red lights mark the tail so other trains and track users know which end is leading and which is trailing. That’s why a single motor car with no rear lights doesn’t meet the definition, and rolling stock kept only in yards isn’t on the mainline, and a signal device is not the train itself.