Trains are higher than cars so you often step up when you are boarding it. Compare this with getting into a car where you have to sit down and "scrunch up" your body. It's helpful to learn the prepositions with their phrasal verbs, so: get in a car get out of a car get on a plane, a bus, a train, a tram, a trolley-car etc. get off a plane ... etc; Hope that helps! Lucie