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How do electric trains move?

Trains are very big and heavy. We know that electric trains move by electricity. But how do they work?

If you look closely, you are sure to see power lines running either above the electric train or alongside the train tracks. Electric trains get their electricity from these power lines. But one power line is not enough for a train to run. Electricity naturally flows from places with a stronger electric force to places with a weaker electric force. This is why two power lines are needed. With an electric train, the train tracks act like the two power lines. In other words, the power lines above the roof have a stronger electric force, and the train tracks have a weaker electric force. So electricity flows from the power lines to the tracks through the wheels and other parts of the train. This electricity runs the train’s motor.