Which is an invention that improved safety for railway passengers? a - refrigerated rail cars b- pullman sleeping cars c- time standardization d- air brakes

The correct option is "D": Air brake for the railway system was an invention that improved the safety of its passengers. The power braking system which was patented by George Westinghouse in 1868 operated by means of compressed air. This air brake system which was adopted universally became very safe and effective for preventing freight as well as passenger trains' accidents.

Air brakes improved the safety of the railway passengers  

Further Explanations:

Air brake were designed by George Westinghouse on 13th April, 1869.The modern air brakes used in railways are designed from the air braked designed by George Westinghouse, which have compressed air as an operating medium. It is also termed as fail safe air brakes.

In the air break compressed air exert pressure on a piston in the cylinder, which is connected through a mechanical linkage to shoe brakes. The shoe brakes rubs on the wheel of the train, and thus slows down the train by creating friction. The pressurized air from compressor is transmitted from car to car of the train through hoses and pipes beneath each car. The main problem is that if there is leakage in any of the pipe, it will result in the loss of pressure and thus will reduce the force on the brakes. This can easily create a situation of runaway train.

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1. Establishment clause would

2. Elizabeth Cady Stanton is most noted for?

Answer Details:

Grade: High school

Subject: US History  

Chapter: Air Brakes

Keywords: George Westinghouse,Air brake, piston, cylinder, mechanical linkage, shoe brakes,friction, pressurized air, compressor,hoses, pipes, leakage,runaway train Universally.

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