A train is a type of vehicle that runs on a track or track. To move, it uses a special type of engine that runs on electricity, gas, or diesel fuel. The engine pulls the train along the tracks. The train has several cars, which are like boxes that are connected together, and inside the cars people can sit or stand. The tracks have special rails on them that the train runs on, and these rails are connected to a power source. The power source sends electricity to the train's engine, which powers the wheels on the train and makes it move forward.