The longest cargo trains can stretch for more than 7 kilometres.
That is longer than 70 football fields lined up in a row. These giant trains carry heavy rocks across the land.
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Cars use four wheels and an engine to zoom down the road.
Buses can carry lots of people to school and work all at the same time.
Motorbikes have two wheels and are very popular in Vietnam.
Trains run on metal tracks and can pull many carriages in a line.
Bicycles move when you push the pedals round with your feet.