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While the plow could drive with the overhead wire, she proved to be more efficient drawing 600-volt juice from diesel-electric locomotives, pushing the plow and dragging along a tool car and hack (caboose.)
In all, there were four steam to diesel conversions; X-900212 and X-900214 were assigned to the Rocky Mountain Division on St. Paul Pass between Avery and St. Regis. X-900207 and X-900215 were assigned to the Cascade Division, operating mainly on Snoqualmie Pass between Cedar Falls and Easton.
These rotary's were often referred to as "slide rotary's." They had fewer blades - but much stronger - for tossing small trees and boulders off the track!
All remaining Milwaukee Road steam rotaries were scrapped in the ‘70’s. Here be a photographic roster showing the variety of snow plows employed by the Road.
From the Milwaukee Road Archives, the Operation Manual for snow plow X-900212. Note the letter signed by the legendary Mr. Wylie!