But if the X30/X31 were ever to be made standalone from the X70/X71/X72 and the X21 was allocated E400MMCs, would it not make sense to run the X30/X31 out of Chester Le Street Depot given the driver changeover needed at Stanley as well as keeping the bulk of E400MMCs together for flexibility? Stanley to CLS is less dead mileage in the pool van compared from Stanley to Hownsgill. The only slightly increased dead mileage would be any evening / Sunday X72 journeys which start and finish at Crookgate.