All of the scenes depicting Stockholm Central station were filmed in Krylbo station because its resemblance to the 1940s look of Stockholm.
Let him walk wherever he likes, this whole train is headed straight toward the fires of hell anyway.
Young nun: I too think it's important to maintain a positive attitude.
The edition of Wittgenstein's "Tractatus logico-philosophicus" that we see was first printed in 1992 (2nd ed. 1997), it could not be available at the time when the film takes place, 1945. The 1992 edition was a re-preint of an older edition from 1961. Tractatus was first published 1921, but with a German title, "Logisch-philosophische Abhandlung".