The metro is fast and efficient. It's a combination of underground subway and light rail on the surface (sneltram). Only some 3.5km of track between the Central Station and the Amstel are actually located underground. The four metro lines all depart from Central Station and head out to their final destinations at Westwijk, Gein, Gaasperplas and Isolatorweg. A new line to Noord will be added in the future, hence all of the construction around town.