RailTaxis are individual vehicles which run autonomously and automatically on existing rail tracks. They provide a turn up and go service from a station, so users do not have to wait. At peak demand when the system is operating near to capacity, the individual vehicles are combined to form conventional trains.
Advances in energy storage mean that trams no longer need overhead wires. They are very short vehicles with seats at either end and a single set of sliding doors on each side. At busy times they link together in sets and operate like metro-trains.
Multi-car trams can be as long as a short train, and they can be much more frequent, giving a higher overall capacity on the route.
The convenience of never having to wait more than two or three minutes makes these inter-town routes very popular.