Two stories from long ago.
The first was a young junior manager at LM HQ, Euston House who used to enjoy an evening drink. He lived at Rugby, and made for the 21.25 Perth. One morning he came in to work looking far from fresh. He'd slept soundly until sometime after Carlisle but, by amazing luck, he'd been able to make a quick cross platform change at Motherwell onto a delayed up service, which rolled into Euston about 08.40 - just in time to start work again!.
The other tale was told to me, so I can't vouch for its authenticity, and wasn't of actual over-carrying. There was an organisation at GM Paddington where the head of section was far from popular with his staff. Nevertheless, the all went out for an office drink one Christmas Eve. The HoS became tired and asked one of his staff to help him board the right train at Paddington for his journey home to Reading. Perhaps emboldened by alcohol, the clerk concerned persuaded him to board a train that was first stop in the West (Exeter, at least). The clerk had time to think about things over Christmas, and was not looking forward to his boss's reaction when he returned to work. However, the reaction was congratulations not criticism. Amazingly, by coincidence the train had had a special stop order at Reading for some reason, and the clerk was congratulated for arranging for him to reach Reading so quickly!