Okay, little buddy! Imagine a train driver is like a captain of a magic train. They have special tools and helpers to tell them when to go and when to stop.
1. Signals: Train drivers look at colored lights called signals. If the light is green, it's like a big thumbs-up that says 'GO!'. If it's red, it means 'STOP!' So they pay close attention to these lights.
2. Timetables: Train drivers also have a special schedule called a timetable. It's like a treasure map that tells them what time to leave and where to go. They follow it just like you follow steps to finish a puzzle.
3. Comfy Stops: When they get near a station (that's where people get on or off the train), they slow down and watch for marks on the ground. These marks help them know exactly where to stop and let everyone out.
So, with the help of colored lights, fancy schedules, and special marks, train drivers know when to leave and where to stop, keeping everyone safe and happy on their journey!