You could argue that because the railway is a public service, the priority shouldn't be about a project being cost effective (within reason) but that if the infrastructure is in place to provide something which could help people - go for it!
The argument that “railways are a public service therefore …” seems to be used on here increasingly to justify all sorts of unviable proposals
I mean my local library is a public service but I don’t expect it to open twenty four hours a day
And people can only speculate at this point - it could be the case that the overnight rail travel market would boom if there was the option of a service to use
Sure, but where?
If the Caledonian Sleeper needs huge sums of subsidy thrown at it (despite London to Glasgow/ Edinburgh obviously being huge markets with daytime trains that are both frequent and profitable… and the journey time in the Sleeper being broadly commensurate with a good night’s sleep) then what other markets are there?
Would people really want to arrive somewhere at three in the morning?
How are you going to cope with overnight engineering?
What about the inevitable antisocial behaviour? (Given that the late night service from Newcastle to York etc had to be abandoned given the repercussions of a few drunks)
Do you keep a massive station open overnight for the sake of this token service? Or do you use smaller stations that’d be cheaper to staff?
Are you giving up on the “freight” idea?
The further we get into this, the more it looks like “I Want X” + “Railways Are A Public Service” = “This Niche Thing Needs To Happen Because Railways Should Be A Public Service And Not Just Focus On Large/Medium Flows…And If They Don’t Start This Strange Service Then I’ll Ask Why They Hate Passengers”
If overnight travel in this example is not worthwhile, why do coach companies bother to put on a coach to cater for this purpose? TPE have also in the past operated services through the night between Blackpool-Manchester-York throughout the week.
I’ve used them in the past from Sheffield to Manchester Airport, but these were regular 185 operated trains, not some weird mash up of cement train with a few carriages tagged onto it
Airports make sense as a destination since they are one of the very few places where a significant enough number of people need to arrive/depart in the middle of the night