(11 Apr 2015, 5:58 pm)mb134 wrote Maybe to do with the vehicles, and the reliability??
Well Arriva need to sort it out ASAP. Fair enough, it's not the fact that they're old vehicles or even ADL E400s for that matter, it's the fact that they've been hammered on very demanding routes (501/505/518/X93/93) bar their intended stints on the 308 and X31/X32/X33. Can see a double deck version scenario of what GNE suffered with the Omnicities on the Angel where until a new order is placed to replace 7501-7509, they might be in a scenario where they'll have to allocate a load of cascaded ex London Deckers if any are available and that would be a disaster.
The only routes that I could see them vehicles appearing on after the X21 / X22 would be the 43/44/45 or if a capacity increase was needed, 35/35A.