1. Context

The word tramway originally referred to a railroad track consisting of 2 parallel rails on which steel-wheeled urban passenger vehicles travel, and then by extension to the electrically-powered urban or suburban transport vehicle running on these rails, often embedded in the roadway, and guided by them.

A single-body motor vehicle capable of towing one or more non-motorized trailers is called a self-propelled vehicle or, more commonly, a motor tractor.

A trainset is made up of several railcars running in multiple units (MUs), which can carry one or more trailers. It is also the generic term used to designate a large-capacity vehicle made up of several articulated bodies for internal passenger traffic.