William Buchanan (locomotive designer)

William Buchanan (March 6, 1830 – January 20, 1910) was an American mechanical engineer. He spent most of his career designing high-speed steam locomotives for the New York Central Railroad including the New York Central and Hudson River Railroad No. 999 locomotive, designed to travel over 100 miles per hour (160 km/h). He also designed and improved freight locomotives for hauling heavy commercial freight. He was an authority on mechanical engineering in America and Europe and was elected to membership of the Institute of Civil Engineers of London.