>I have been on a few overnight trains here in Sweden and they have all been quite old, noisy and shaky ones.
I've been on an overnight snabbtåg (SJ) from Köpenhamn to Stockholm to Norrköping and it wasn't that bad (however, I was the only one in my [train] car).
Overnight ferries are quite nice, I'll concede, such as from Holyhead to Dublin or Dublin to Cherbourg; however, that falls to the wayside when the seas are quite rough. In that sense, I would prefer the rickety train to the heaving ship.
I've been on an overnight snabbtåg (SJ) from Köpenhamn to Stockholm to Norrköping and it wasn't that bad (however, I was the only one in my [train] car).
Overnight ferries are quite nice, I'll concede, such as from Holyhead to Dublin or Dublin to Cherbourg; however, that falls to the wayside when the seas are quite rough. In that sense, I would prefer the rickety train to the heaving ship.