Night trains were once expected to vanish. Low cost airlines offered faster journeys across Europe, and railway companies, faced with ageing carriages and high running costs, retired many sleeper services. In recent years, however, several have returned, and some are fully booked weeks in advance.
The revival owes something to changing attitudes to flying. Travellers who worry about the carbon cost of short flights have started to look for alternatives, and a sleeper train offers one that also saves a night's hotel bill. Yet sentiment alone would not keep services running. The operators that have succeeded tend to run fewer, better trains on routes where the daytime journey would be too long for comfort, such as eight to twelve hours, and they invest in private cabins, which can be sold at higher prices.
Not every route will work. On corridors served by fast day trains, a night train has little to offer, and cross border services still depend on timetables and track fees negotiated by several national authorities. The comeback is therefore best seen as a niche that has found its market, not as the start of a general return to the rail network of the past.