I'm sitting here waiting on a repairman and doing some more picture looking. Did you ever wonder how they kept the passes clear in the 19th century for the Railroads? Before the middle 1880's they were shoveled by hand or the trains just didn't run. In the 1880's the rotary plow was invented and used a separate steam engine to power the plow which was pushed by one or more steam locomotives.
These pictures were taken about the time of WWI but show what these looked like, the first is the set up heading to the big drifts on the Denver and Salt Lake RR.
The second is plowing snow in Rollins Pass west of Denver.