(30 Jul 2016, 5:24 pm)South Tyne Lad wrote The X20 compared to the X14/15/18 is less of a demanding route.
It should also be noted 7517 hasn't been allocated regularly allocated to the X20 since being held on this restriction.
It has been allocated to the 35, Allocating it to the X20 is a last resort spare.
Hardly, I'd call flat out along various dual carriageways pretty demanding. Less demanding than the X18, granted, but as it's proper allocation is the X14, that's a moot point.
When you read GX03 SVC's post, it certainly doesn't sound like it's used as a 'last resort' on the X20...