Related Clues:

• Passenger vehicle
• Freight carrier
• Train unit
• Train part
• Coach, e.g.
• Train component
• Tram, for one
• Track runner?
• Sleeper, say
• Part of a track team?
• It hooks up to an engine
• Caboose, for instance
• Coach involved in training
• Plymouth passenger carrier
• Bird - robin in UK, roadrunner in US