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 Cooper Institute - Elevated Railroad. Mary WaltonSuggested ReadingMary WaltonMary Walton developed a method of deflecting smoke stack emissions.In 1879, Mary Walton patented a method of deflecting smoke stack emissions (U.S. patent #221,880) through water tanks and later adapted the system for use on locomotives. Mary Walton also invented a noise reduction system for elevated railroads in New York City. In the 1880s, many cities developed a mass transit system using noisy elevated trains. To reduce the noise, Mary Walton invented a sound-dampening system that cradled the track in a wooden box lined with cotton and then filled with sand. She received U.S. patent #237,422 for the system on February 8, 1881, and later sold the rights to the Metropolitan Railroad of New York City.
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