You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "When was the American entrepreneur and engineer died based on who's patent modern trains rely upon a fail-safe air brake system?" whose answer is March 12, 1914.
Each document should contain about 30 words, and these documents should contain useful information.

Query: inventor of the fail-safe air brake system for trains
Useful Output:

Doc 1: This fail-safe air brake system is based upon the a patented by George Westinghouse in 1872. An air brake is a conveyance braking system causes by compressed
Doc 2: By the early 1990s, “the railroad industry recognized that the current air-brake system was an extremely mature technology,” says Fred Carlson, who recently
Doc 3: The air brake, introduced by inventor George Westinghouse in 1869, revolutionized train transportation. Westinghouse's air brake system used
Doc 4: George Westinghouse The first air brake invented by George Westinghouse revolutionized the railroad industry, making braking a safer venture
Doc 5: Engineering pioneer George Westinghouse Jr. received a patent in 1869 for the system, which used compressed air to actuate the brakes on a