Brake tender

Okay, so imagine you're playing with a toy train set, and you want the train to slow down or stop. You might use your hand to gently press on the train and slow it down, right?

Well, on real trains, they have something called a "brake tender" that helps slow down or stop the train. The brake tender is an extra car that's attached to the end of the train, and it's filled with special equipment that helps control how fast or slow the train goes.

Inside the brake tender, there are usually two big tanks filled with compressed air. This compressed air is what helps control the brakes on the train cars. When the train driver wants to slow down or stop the train, they use a special valve called a "brake stand" to release the compressed air from the tanks. This causes the brakes on each car to engage and slow down or stop the train.

So, in short, a brake tender is an extra car on a train that has special equipment to control the train's brakes and help it slow down or stop.