French phrase
Dans quel wagon dois-je ~ ?
Meaning
Which train car should I ___ in?
When to use it
A polite question about the appropriate train car. Used when seating is uncertain, such as with reserved or quiet cars.
Example dialogue
Dans quel wagon dois-je m'asseoir ?
Which train car should I sit in?
Si votre billet indique un wagon, asseyez-vous dans ce wagon, sinon installez-vous où vous voulez.
If your ticket indicates a train car, sit in that car; otherwise, sit wherever you like.