Trains are very big and can be dangerous if they don't follow rules, just like when you play a game. They need special signals to know what to do.
1. Red Signal: When the signal is red, it means 'stop.' Just like a stop sign for cars! The train has to wait and can’t move.
2. Green Signal: When the signal changes to green, it means 'go!' This is when the train can start moving again.
3. Yellow Signal: A yellow signal means 'prepare to stop' or 'slow down.' The train knows it should get ready to stop soon.
So, a train starts moving after the signal shows green! And just like you check your traffic light before crossing the street, trains check these signals to keep everyone safe!