Tram to supertram

`Light rapid transit¿ is essentially an upgraded tramway; in the popular idiom it is a `supertram¿. It is often developedon the basis of a conventional electric tramway, it generally operates on its own segregated right of way, and it incorporates up-to-date equipment based on proven and accepted technology, but without necessarily incurring all the costly system in on the middle ground: betweeen the ordinary street-running transport mode(the bus) and the fully-equipped rapid transit system (the London Underground)