The question was: Why is that woman walking naked across the tracks?
Answer: She was stripped in the restroom of the train. And she was stripped because she forced a guy to strip. The flying trousers in the 'sunbathing'-clip are from that forced stripping. Don't ask me why she forced him to strip! I think the movie is about a secret formula to make gasoline out of water!
https://forum.oneclickchicks.com/showthread.php?t=13368
(German Movie 2)