(11 Feb 2015, 5:01 pm)DaveyBowyer wrote Well, becuase the Pronto needs a powerful vehicle and the only time the 310 benefits from power is between Station Road and Benfield Road.
I don't think the X21 needs a large amount of power, I know it goes down the A1(M) and fast parts of the A167 but I think Enviros would possibly be fine.
Although the Wright demonstrator it had last year was a little slow down the A167 between Cock O' the North and Croxdale when I rode it. Some will say that it often fell behind the timetable on the X21 and Toonlink services but I don't think these delays were all down to being underpowered I think part of the problem was that it was carrying the Lothian colours which would have been confusing people along with the unusual destination screens so some people had difficulty in finding if it was on their service and which operator the bus was with.