Gresley conjugated valve gear was used by the American Locomotive Company under license and the 4-12-2 locomotives they built for the Union Pacific Railroad between 1926 and 1930 were the largest locomotives to use this valve gear.
Gresley conjugated valve gear was used by the American Locomotive Company under license for the 4-12-2 locomotives built for the Union Pacific Railroad between 1926 and 1930. These were the largest locomotives to use this valve gear.