How comfort was a train?

It is correct to say "On the train" when you are inside it. either one will work This is also known as being 'on board' the train.

Get on the train.

Actually, the engineer controls the train's movement in & out of the station. The engineer is in control of the train movements with one exception- when a train is put together. A hostler...

Not a direct train, you will have to change at Peterborough

Well, On the Aylesbury to Maryleone line, only Chiltern Railways are used but the mainline on the west cost uses Virgin. Banbury is the only station where these two collide