Hi,
The train in on Track 9.
Does the sentence above mean the the train is on Platfrom 9?
The track is what the train runs on top of. Tracks have numbers. I wouldn't say that platforms necessarily have the same numbers. For example, two platforms, on either side of a track at a station somewhere along the track, might just be termed 'platform 1' and 'platform 2'. However, in a terminal at the end of the line, I wouldn't be surprised if the platform did indeed have the same number as the track. Consider this excerpt from a famous song from the Big Band era, which refers to a train, a station and a track, but no platform. That suggests to me that it left from Platform 29. A choo-choo is slang for a train.
Pardon me boys, is that the Chattanooga Choo Choo?
(Yes Yes) Track 29!
Boy you can give me a shine
(Can you afford to board, the Chattanooga Choo Choo?)
I've got my fare
And just a trifle to spare
You leave the Pennsylvania station 'bout a quarter to four
Read a magazine and then you're in Baltimore
Best wishes, Clive