[QUOTE=Scouseinmanc;81508]How could Lime St be extended? There isn't any room for extension to the left or the right of the station. Even if there was, there are only 4 tracks within the station throat, QUOTE]



There are actually 6 tracks (don't forget the one in the tunnel) at Lime Street Station throat, which would make it even more difficult to extend. Platform 6/7 could be extended for longer trains. 12/13 coach expresses used depart regularly I think.