In 1868 by george westinghouse
Westinghouse developed the air brake for trains.
George Westinghouse invented the air brake, and created the Westinghouse Air Brake Company to manufacture and sell it. That company is still in business.
George Westinghouse invented the air brakes
westinghouse
Wheels, air brakes, engineer, conductor, air hoses, journals
Westinghouse.
Visit the following link to learn more about the difference between air brakes and regular car brakes: http://auto.howstuffworks.com/auto-parts/brakes/brake-types/air-brake.htm. In short, air brakes are made to prevent trucks, trains and buses from crashing.
Zachary Frank
trains invented pollution
I assume air brakes on trucks and trains are similar. 1 - It doesn't freeze. 2 - Allows massive pressure differential with large "slave cylinders". 3 - Tolerant of leaks. 4 - Robust system for trailer interconnects. A hydraulic system would risk air bubbles at the interconnects. 5 - Relatively simple design.
Bullet trains were first invented in japan!