Alright kiddo, imagine you're on top of a really really high mountain, but you're not tired and you don't want to walk down. So instead, you take a special kind of train that goes down the mountain.
The mountain railway is like a train that can climb up and down very steep hills and mountains. It's not like a normal train that runs on a flat surface.
It has wheels that have really strong grip to the tracks so it won't slip off. The train also has a special engine that makes sure it stays balanced and doesn't tilt over.
As the train goes down the mountain, you'll see some beautiful views that you wouldn't be able to see if you were just walking down. It's just like going on a roller coaster, but slower and not as scary.
Overall, the mountain railway is a really cool and unique way to travel down a mountain while being safe and fun at the same time!