An electric locomotive is a big train that doesn't need fuel like gas or oil to move. It gets its energy from electricity. This electricity comes from the wires that hang above the tracks, and it uses a special device called a pantograph to get the electricity from those wires. The pantograph looks a bit like a long metal arm that reaches up to the wires, almost like a giraffe using its long neck to reach leaves on a tree.
Once the electric locomotive catches the electricity from the wires, it uses the power to turn big wheels that move the train. The electricity powers a special motor that turns the wheels using something called magnets. Imagine two magnets that pull each other closer; the electric locomotive uses this magnetic power to turn the wheels round and round, making the train move.
Electric locomotives are very helpful because they are strong and can pull lots of heavy trains for a long time. They also don't pollute the environment like some other trains that need fuel to run. They don't make as much noise either, so it's easier to travel on them without being disturbed.