National rail is like a big train system that helps people travel around the country. It's sort of like a big puzzle with lots of pieces (trains) that fit together to help you get from one place to another.
Think of it like a toy train set. There are tracks that connect all the different stations. The trains follow these tracks to get from one place to another. National rail is just like that, but on a much bigger scale.
You can buy tickets to ride on the trains and choose where you want to go. The trains run on a schedule, so you can plan your trip and know exactly when you will arrive.
There are different types of trains that run on national rail. Some are very fast and can get you to your destination quickly. Others are slower, but they might stop at more stations along the way.
There are also different classes of tickets you can buy. Some seats have more space and are more comfortable, but they can be more expensive.
Overall, national rail is a great way to travel around the country by train. It's reliable, safe, and easy to use once you understand how it works!