Appreciate I am a bit late to this discussion.
However I know of several examples in Scotland where dormitories were provided for enginemen on lodging turns
At Brechin, a large and impressive branch line terminus in Angus part of the station building was a dormitory.
In Mallaig at the end of the West Highland line there was a separate dormitory block across from the platform.
And I believe there was also a dormitory in Kyle of Lochalsh.
So perhaps this was not so unusual?