It is hard to say precisely when on Monday the promise of revived romance aboard Britain’s oldest night train came closest to derailing. Perhaps it was at 11pm when, with no train to be seen, the first class lounge at Euston station shut its doors. Passengers who had been planning to board the newly relaunched Caledonian Sleeper at 10pm for haggis and a nightcap plodded instead on to Euston’s cold and emptying concourse. Perhaps it came at about 11.30pm, in Upper Crust, the only station café still open. The senior communications officer from Serco, the outsourcing giant that runs the service, found himself positioned beside the tills, repeatedly tapping the payment machine with his credit card as passengers lined up for a consolation cup of tea and/or baguette. Or perhaps it came at about midnight, when Upper Crust shut too, and our shiny new train to Scotland was still stuck at a rail depot in Wembley. “If the old train were sitting at the next platform ready to go, we’d all get on it,” said Michael Steed, a tax consultant from Kent who had meetings in Edinburgh the next morning. By 1am, all 16 gleaming carriages of the sleeper had finally rolled in at platform 15 and passengers were invited to board. The singular mix of weary resignation and wry humour that clings like wet leaves to the UK’s rail network turned fleetingly to hope. Now, we were stepping into a new chapter for British sleeper trains, three hours after the doors were due to open, a year after the planned launch of the new carriages — and 145 years after rail travellers first snored their way between Scotland and England.