When the Channel Tunnel was first announced in the 1980s, it was part of the proposals to operate high-speed rail services through it on both sides of the English Channel with a substantial network envisaged. This was gradually reduced to a core service, along dedicated TGV-style high-speed lines, between the three capital cities, regional daytime services to Glasgow Central via the East Coast Main Line and Manchester Piccadilly via the West Coast Main Line, and Nightstar sleeper services to the same cities as well as Plymouth and Cardiff via the Great Western Main Line.