Okay kiddo, imagine you have a pizza with toppings on it. The pizza is divided into slices, right? Now imagine that you can spin the pizza around like a wheel. This spinning pizza is called a "sector plate".
A sector plate is like a spinning roundabout that is used to help trains switch tracks. Instead of pizza slices, it has different tracks attached to it, and by spinning it, the train can move from one track to another.
Now, imagine you are playing with your toy train set. You have different tracks that your train can go on, but sometimes you want it to switch from one track to another. A sector plate helps with that.
The sector plate is a spinning platform that has train tracks on it. When the train reaches the sector plate, it can spin around to the desired track. This is just like when you spin the pizza around to get a different slice, except instead of pizza, it's trains!
So in short, a sector plate is a spinning platform that helps trains switch tracks. It's like a spinning pizza for trains!