What type of train does not carry revenue passengers?

The type of train that does not carry revenue passengers is a deadhead train. A deadhead train is primarily utilized to reposition crew members or rolling stock without transporting passengers or freight. This type of operation is essential for ensuring that trains and crews are available where they need to be for scheduled services.

While M-Series equipment refers to a category of passenger trains used for carrying revenue passengers, and freight trains carry goods rather than passengers, light engines are locomotives that can operate without any attached cars, and while they may not be carrying passengers at the moment, they can still be used in revenue service. The distinguishing factor of a deadhead train is that it is specifically designated for non-revenue purposes, making it clear that it does not transport any paying passengers during its movement.