Grooved rail

Okay kiddo, have you ever seen those tracks trains use to move around? Well, sometimes those tracks have grooves in them called grooved rail.

These grooves help make the train go a little smoother by giving the wheels something to grip onto, which helps prevent them from sliding around. It's kind of like when you wear shoes with treads on the bottom when you're walking on a slippery surface - it helps you keep your balance.

Grooved rail can be used in places where the tracks need to handle a lot of turns or curves, because it helps the train stay on the tracks and not slide off. It's also used in places where the tracks need to be quiet, because it helps reduce noise from the train passing by.

Overall, grooved rail is just a fancy term for tracks with grooves to help the train run more smoothly and safely.