Northern-spirit.co.uk
A train is a series of connected vehicles. Most people think of a train as vehicles on rails. A single (moving) locomotive is also referred to as a train, but strictly speaking incorrectly.
In tourist areas, a train often runs, but not on rails. It consists of a tractor (with pneumatic tires, steerable wheels and a number plate) that looks like a locomotive, with a number of trailers. According to the correct definition, such a road train is indeed a train.