I don’t think that allowing 2 sets to be coupled, cleaned and turned around in 20 mins at quite a busy time, that are frequently late into Pad in the first place was the best idea and I was hoping it would have been changed in the last timetable change. It was cancelled Tuesday after both units coupled mechanically but not electronically, they then failed to uncouple resulting in them having to be manually uncoupled after which it was decided best for both units to be returned to North Pole for investigations, even when there aren't issues coupling, the trains that form it are frequently late into Pad