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1) I know that there are passenger trains, goods trains, and mail trains.
2) I think that long distance trains are the most convenient railway vehicles for travelling over long distances.
3) As a rule, four passengers can travel in a sleeping compartment. There are also 2-berth compartments.
4) While travelling by rail, passengers can have their meals in the dining car. Some passengers prefer having meals in their compartments.
5) Passengers can enjoy the passing scenery from a moving train.