In August 1903 Stone was elected grand chief engineer of the
International Brotherhood of Locomotive Engineers to succeed
Peter M. Arthur, who had died unexpectedly. Stone was a Republican but had progressive views. Several U.S. presidents offered him political appointments, but he refused them. Stone believed that if a worker "wants to join a union, all right, but it is contrary to the principles of free government and the Constitution of the United States . . . to make him join." He had no problem with "labor capitalism", where union members would invest their savings to achieve the maximum return, even if that meant investing in non-union enterprises. Stone was proposed as a challenger to
Samuel Gompers, President of the
American Federation of Labor at that organization's Chicago conference in January 1920. Gompers believed the federation should take a non-socialist approach in representing wage-earners, campaigning for better wages, better hours, better working conditions and the unfettered right to strike. Stone supported the radical
Glenn E. Plumb plan for tripartite control of the railway industry by labor, capital and the public, and supported similar plans for other industries. Stone appeared on the cover of
Time magazine on 10 March 1924. Stone was one of the main supporters of the
Progressive Party that backed Senator
Robert M. La Follette, Sr. as candidate for President of the United States in 1924. In June 1924 the triennial convention of the Brotherhood created the office of President and elected Stone to this position. He was succeeded as grand chief engineer by L. G. Gritting. ==Financier==