Willamette Iron and Steel Works The Willamette Geared Locomotive Design

Drawing by E. L. Hauff, from THE WALLEMETTE LOCOMOTIVE book

Willamette Locomotive Rosters (By CN, owners or locations)

Willamette Iron and Steel Works in Portland OR, was well established in the Pacific northwest, as a logging operations supplier, when they expanded into locomotive building. Their design of the Willamette locomotives, was focused on logging, incorporating all of the modern (in 1922) aspects of a Shay locomotive and the standard features most requested by western loggers; steel cabs, girder frame, cast trucks, air brakes, electric headlamps.

All Willamette locos were Standard gauge, 56½".

33 were built in Portland OR, between Nov. 1922 and Dec. 1929; 1 ordered and cancelled in 1927.
Three class sizes were built:
50-ton, 2-truck, with 3-11x13 cylinders, 2 built, 1 cancelled.
70-ton, 3-truck, with 3-12x15 cylinders, 27 built.
75-ton, 3-truck, with 3-12½x15 cylinders., 4 built

Designed and introduced in late 1922, the high point in production was 1923, when 11 were built and shipped. By 1929, only one, the last one, was built.
Seven survive and are displayed.

Sources:
The 1977 book "THE WILLAMETTE LOCOMOTIVE, by Steve Hauff and Jim Gertz, published by Binford & Mort, Publishers, Portland OR
2018 Basic Willamette Data; Statistical Formula chart by George R. Kadelak