An adhesion railway is like a train that can stick to the tracks like glue. The train uses its wheels to grip onto the tracks and move along them, kind of like how a car drives on a road. This grip is called "adhesion."
The reason why adhesion is important is because it allows trains to go up and down hills without sliding back down or tipping over. This is because the wheels can grip onto the tracks even when they are slanted.
Adhesion railways don't need any special equipment like magnets or special tracks to stick to. They can work on regular train tracks that you see in your neighborhood. This is because the train wheels themselves are designed to provide enough grip for the train to move forward.
Overall, adhesion railways are a really cool way to travel across long distances quickly and safely!