Climax #1638, The Pacific Lumber Co. #33.
This 80-ton engine was the first Climax delivered with piston valved cylinders, in fact, it was the first geared locomotive built with piston valves as standard equipment, something Shay and Heisler would not do for another 5 years. This locomotive was built with the then standard arch bar trucks. Compared to the complexity of the Willamette and Shay trucks, the Climax design was engineered for simplicity. After assembling the model Climax arch bar trucks, I have been very impressed with how Climax was pushing the casting technology of the time in designing the cast truck parts for a minimum of required machine work before assembly.