That begs the question however, if it's got a defective cab, how does it move out of Euston?
Or are they allowed to drag a dead loco on ECS moves?
Yes - as Scott says, the Glasgow ECS moves (both evening and morning) always has a loco attached at both ends...
...the 5M16 (Highlander) ECS move every morning at Euston still has the 1M16 loco attached on rear;
The 5M11 ECS (Lowlander) ECS move in the morning at Euston varies - the usual approach is for the 1M11 loco to be left on the blocks and it runs round to take 5m16 back to Wembley (with 1M16 loco on rear as above). However,
IF there is some issue with the (now) north-facing cab of 92014, it can be left on the back of the stock and go back to Wembley with 5M11; and 86101 can instead run back in after it's done 5M11 to take 5M16.
Are you thinking of the "ban" of running the Sleeper in service on the WCML with a 92 on the rear? If so, this is more of a passenger comfort issue due to the way the 92s are braked (or not!) in this formation which means they clatter into the back of the coaches every time it brakes resulting in plenty of jolting etc. Not an issue for ECS moves though.