Japanese phrase
___は何番線ですか？ ___ wa nan ban sen de su ka
Meaning
Which platform does ___ leave from?
When to use it
Asks which platform number a train uses. This polite question is common at stations when the correct departure platform is not known.
Example dialogue
新幹線は何番線ですか？ shin kan sen wa nan ban sen de su ka
Which platform does the bullet train leave from?
5番線です。 5 ban sen de su
It leaves from platform 5.