Lots of extensions to the system have opened since then, with more that are currently being built or proposed. Metrolink now has lines that serve Didsbury, Ashton-under-Lyne, Oldham, Rochdale, MediaCityUK and Manchester Airport. These expansions increased the system's length from 37 km to 97 km with 99 stops. In 2017 a second line through Manchester city centre serving Exchange Square, opened and later another line towards the Trafford Centre shopping mall. There are also plans for tram-train lines to Stockport and other places in Greater Manchester. By 2040 the intention is to double the size of the network. 