Thanks to a tramway building spree that has ended, Britain now has seven tram systems, all of which have substantial populations (apart from Blackpool – the only one that had never closed). Whilst extensions are being planned there are no new ones. In Denmark, where all of its tram system had closed (the last was Copenhagen, in 1972), it is now building it first new one, in Aarhus (tram vehicle and new tram bridge pictured – photos by Erland Egefors) for a population far smaller than the new systems in Britain. Is there a lesson here?