Its normal, at least in the US, for passengers to step up into the car. Passenger cars have two steps built into them but it still makes a very big step up or down from there. Stools are often provided for women to use. One side of the platform will, often, be raised higher with a ramp to make it easier to load baggage (or freight if its a combination passenger/freight station). The raised portion should be high enough to be even with the baggage or freight car doors. I can't give you an exact height since I don't know what you are using for a train.