When I was a student doing the summer-in-Europe thing, I took my student railpass and took the overnight train from Copenhagen to Uppsala, because I really wanted to see Uppsala. Long story. But anyway, I have the loveliest memories of the place.
Except there's this Bergman movie in which there's a scene of a particular corner with yellow stone buildings and cobblestone streets, and it gave me intense physical flashbacks to dragging my no-sleep self and excess luggage past that very corner looking for someplace to sleep. Wound up at what seemed to be a private hostel out in the country. It was full, but the lady took pity on me and let me stay in the attic. The view was incredible...
And the sound of the train conductor calling the stops. Linköping is the one I remember.
Of course, this was in 1971. But in my mind, it's still lovely.