"What does the station you are waiting in front of look like?"

Translation: Jak vypadá to nádraží, před nímž čekáš?

[Praha2017]

What's wrong with this translation: "Jak vypadá ta stanice před níž čekáš" ? I don't see a mistake.

[VladaFu]

It is correct. "před níž" is formal or bookish in my opinion so would not be the first choice in this situation in a spoken conversation.

Added. "Jak vypadá ta stanice, před kterou čekáš." was already there.

[dude_in_sky]

Why "nímž"? Isn't "před nádraží" supposed to be neutral locative and therefore "němž"?

[endless_sleeper]

Před is (somewhat confusingly) followed by instrumental.

ETA: Unless 'před' means 'motion in front of sth' then it's followed by accusative.