Which Brake Is It?
Air brakes work off high pressure, and the air hoses at the ends of rolling stock are thin. On the other hand, vacuum brakes work off low pressure, and the hoses at the ends of rolling stock are thick.
Air brakes at the outermost vehicles of a train are turned off using a tap. Vacuum brakes at the outermost vehicles of a train are sealed by plugs which are sucked into place.
Read more about this topic: Railway Brakes