Okay kiddo, do you remember seeing those bright lights on the front of a train? Those are called train lights, and they are very important to keep everyone safe.
When a big train is coming down the tracks, it's hard to see it in the dark, and other people and cars might not notice it until it's too late. That's why train lights are really bright, so people can see the train from far away and stay out of the way.
The lights are usually yellow or white, and they help the train conductor see the tracks in front of them as they drive the train. Sometimes, the train lights will even flash to warn people of the train's approach.
These lights are powered by electricity, which comes from special batteries that are on the train. They are connected to wires that run along the tracks and help to make sure the train lights stay on even if something goes wrong with the batteries.
So, in summary, train lights are really bright lights that are on the front of trains to help keep people safe and to help the conductor see. They are usually yellow or white, and they are powered by electricity from special batteries on the train.