(Today, 1:53 am)deanmachine wrote GNEs B9s like to overheat when on long journeys at high speed.
GNE are doing a disservice to the X10 & X21.
Total PVR of both services is 12x (or 15x if X9 brought back).
A new batch of deckers properly rotated between the two routes and looked after, would give 7 years of service. Then maybe cascade them onto something like the 27 or 16/16A/X5/X15 for the next 7 years and repeat.