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When we board a train, ship, or aircraft, we get on it:
I boarded the plane bound for London.
The ship was boarded by customs officials.
When a plane or ship is boarding, it is ready for passengers to get on:
Flight BA193 for Paris is now boarding at Gate 37.
Is it OK to say "the train is boarding (the passengers)"?
Yes. It is OK and common to say "The train is boarding" just as it is to say the same about a plane.
It would be unusual to say "The train is boarding the passengers" even though this is implied.
