Amps They need to get the overnight high speed network sorted across Europe, absolute scones to be seen in the dinning car at 4am I reckon.
Travelling by sleeper train is a great, highly civilised experience, and I did it quite frequently pre-COVID.
Choice:
a) Have dinner at Beijing station, then board around 7pm, slam back a few train beers in the dining car while pissing about on my laptop till 10pm, haul myself into a bunk (2 or 4 person compartment on the decent trains normally), fall asleep, wake up in Shanghai at 7am for a 10am meeting.
b) Get up at some utterly unreasonable hour like 4.30am, 6am get to the airport, 7am flight (delayed 20 minutes), 9am arrival, scoop up bags, mad dash in a taxi across a sprawling city.
I’m surprised they withdrew most of the sleepers in the UK because it’s an absolutely superb way to travel.