(23 Aug 2017, 3:59 pm)Dan wrote Go North East's Streetlites seem to cope fairly well on long-distance and demanding routes? The 8/78 and 20/20A/X20 spring to mind as being the most demanding.
I don't profess to be completely familiar with the services at Darlington, but I can't imagine them being too dissimilar from the aforementioned Go North East services?
Was thinking more in terms of the ones based at Ashington. I've been on a Streetlite operated X18 (418) before, and it struggled for a good amount of the route.