Weight-wise they’d be able to pull it: 2x 73/9s = 3,200hp and a single 73/9 pulled the equivalent of a Load 14 Polmadie to Edinburgh last year. Wouldn’t be able to provide sufficient ETS though - the output would be no more than a single one as it doesn’t double-up in the same way.
If a diesel diversion was required from Carlisle it’d need to split there I reckon and go forward as 2x Load 8s.
Worth noting that pretty much all Glasgow - EDB routes is now electrified and cleared for 92s, so plenty more options compared to the past to divert with the 92 still attached (eg Carstairs to Edinburgh via Whifflet, Cumbernauld and Falkirk).
Only one they wont be able to use is the route via Bathgate
