Uni-directional vehicle

While the vast majority of road vehicles are like this, the term generally refers to a train or tram with a distinguishable front and rear end and a single operating cab at the front end.

Because a uni-directional vehicle can only travel in one direction they require special infrastructure for turning around at a terminal station.

This is usually a balloon loop on tram systems, which mainline railways tend to use a triangle junction or turntable.

Unidirectional trams and streetcars operate in many parts of the world, with a significant number running in Continental European cities such as Rotterdam, Amsterdam, Zurich, Berlin, Düsseldorf, and Vienna.

In Asia, uni-directional vehicles can be found in Hong Kong (both tram and light rail) and Kolkata.