A brake van is a special train carriage that helps slow down or stop a train. It's like a really strong brake pedal, but on a train! When a train driver wants to slow down or stop the train, they make sure the brake van is attached at the back of the train.
The brake van has special brakes, called hand brakes, that can be controlled by a person called the brakeman. The brakeman sits in the brake van and uses these brakes to slow down or stop the train.
The brake van is also important because it carries helpful things like tools, spare parts, and extra equipment, just in case something goes wrong with the train during the journey.
So, in short, a brake van is like a safety backup on a train, helping to slow it down and carry important things in case of an emergency.