There are certain prepositions which are often used in the sentences indicating travel or movement.
Case -1 (means of transport)
I travel by train.
He travel by bus.
I would like to travel by car.
Similarly, we can use ‘by’ with other means of transport
-by ship
-by boat
-by sea
-by air
Case -2 use of “on”
-on foot
-on bicycle
-on horse back
Case -3 use “get in/get into” a vehicle
He get into the train timely
Case -4 use “get on” when mounting on horse/bicycle.
Case -5 use “get out” of a vehicle
Case -6 use “get off” a horse,a bicycle
