(16 Jan 2017, 9:36 am)Stuartphin1639 wrote Tyresmoke, is it the same as else where buses get replaced after they've spent 4 years here, if so 7501-9 will be replaced as it's been 4 years since they got them
Some others of roughly the same age are being replaced in Wales on Sapphire service 1. I wouldn't bet against 7501-9 being shifted off the X21/X22 soon either.