What is the definition of a deadhead train?

The definition of a deadhead train refers to a passenger train that operates without carrying any revenue passengers. This situation typically arises when train crews are being moved to a location where they are needed, or when a train is returning to its home terminal after completing a route that did not have fare-paying passengers on board. The concept is important in the context of railway operations, as it relates to how trains are managed for efficiency and to ensure that crew members can fulfill their duties.

In this context, the other options do not align with the specific definition of a deadhead train. For example, a train carrying maintenance equipment signifies that the train has a different operational purpose, and a freight train carrying goods, while also non-passenger, does not address the passenger aspect. Lastly, a train used solely for crew transport does not imply the absence of fare collection and does not specify that it is linked to passenger services like a deadhead train is. Hence, the selected answer accurately captures the essence of what constitutes a deadhead train.