This could be the same vehicle:
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and in my picture the car is being used by the Western Colorado Power Co. line crew at the Silverton Depot. Dave's picture looks like it was parked across the street from my present office at the old WCPCo. "Mule Barn" which is still standing--I'll look tomorrow in the daylight. The 2 front small closed windows on the structure were feed doors into the stalls, which are still intact. If I have the location identified, then the switch in the picture lead to the siding where power poles were unloaded, this being on the Silverton Northern.
The original power line from Tacoma to Silverton ran up the Animas Canyon and the power company had to access that line for maintenance.