(24 Jun 2014, 1:41 pm)Kuyoyo wrote The route they use is via Scotswood View, Cross Lane and Wellington Street - of which there is a 14ft height restricted bridge. So while Stagecoach's E400s can fit under there (they are 13ft 10in), they don't risk it after the deroofing of one of the C-LFT Leyland Olympian when more-or-less brand new back in 1986.
There is also a bit about this and the start of services to the Metrocentre in 1986 in a short section in Peter Nash's Book, Push Once.