The Gresley conjugated valve gear is a valve gear for steam locomotives designed by Sir Nigel Gresley, chief mechanical engineer of the LNER, assisted by Harold Holcroft. It enables a three-cylinder l
LNER Class V2 4771 Green Arrow. Note Gresley conjugated valve gear located ahead of the piston valves, driven from the valve spindles
New South Wales Government Railways D57 class 4-8-2, with Gresley conjugated gear visible at front below the smokebox. The longer 2 to 1 Lever is located on the right side of the locomotive, and the shorter Equal Lever on the left side.
The third cylinder and Gresley gear are visible below the smokebox of this 4-12-2.
C53 10, January 1935
Union Pacific 9000 Class
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The Union Pacific Railroad 9000 Class is a class of 88 steam locomotives, built by ALCO for the Union Pacific between 1926 and 1930.
Gresley conjugated valve gear
…inside big end bearing effectively solved the problems. Gresley conjugated valve gear was used by the American Locomotive Company under license for the 4-12-2 and 4-10-2 locomotives, the Union Pacific 9000 class, built for the Union Pacific Railroad between 1926 and 1930. These were the largest locomotives…
The prototype, UP 9000, as preserved at the Los Angeles County Fairplex in Pomona, California.