In US English, at least in my part of the country, we would say:
"Which is the platform for the inbound trains?"
Train: A train is a set of cars pulled by a locomotive.
Track: The train goes on a track. The track is made of two steel rails connected by hundreds of wooden sleepers.
Platform: you stand on the platform while you wait for the train. When the train arrives, you step off the platform and board the train.
Station: A station is where trains stop. My train station has two platforms, one for the inbound trains and one for the outbound trains. The big terminal in Boston, South Station, has a dozen platforms.