 Following conversion in 1971, the AC services on the Altrincham line continued relatively unchanged for the next twenty years.The Manchester Metrolink is a light rail scheme introduced in the Manchester area in the early 1990s with the aims of reducing traffic congestion by providing modern, attractive public transport options for journeys into the city centre, and offering more convenient interchange between the rail systems north and south of the city.Phase I of Metrolink involved converting the British Rail lines from Victoria to Bury and Piccadilly to Altrincham to light rail operation, and linking the two by a street-running section through the city centre.