Meaning: The people who were on the train left the train.
Choice of Words: Passengers are people who travel on a train or bus. Exited means to leave a place. Train is a vehicle that carries passengers or goods along a track.
Alternative Expressions
Train empty now.
Meaning: This sentence means that there are no passengers on the train at the present time.
Choice of Words: The word empty means that there is nothing inside something, and now refers to the present time.
Train all alone.
Meaning: This sentence means that the train is by itself, without any passengers on it.
Choice of Words: The word alone means that something is by itself, without any other people or things around it.