When was the American entrepreneur and engineer died based on who's patent modern trains rely upon a fail-safe air brake system?
Railway air brake:  Modern trains rely upon a fail-safe air brake system that is based upon a design patented by George Westinghouse on March 5, 1868. George Westinghouse: George Westinghouse Jr. (October 6, 1846 – March 12, 1914) was an American entrepreneur and engineer who invented the railway air brake and was a pioneer of the electrical industry, gaining his first patent at the age of 19.
March 12, 1914