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- Feb 18, 2003
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Both rotaries in use on Donner were originally steam powered, but are now electric powered. The unit behind each plow is the "B Unit", a former cabless slug unit of a "F" diesel locomotive set. The electric power for the plow comes from the B unit.Quick question about the UP rotaries. In the videos I saw of one heading up to Donner from Roseville yesterday, it was venting off a great deal of steam. When I looked up UP's Roseville based rotaries, they were listed in a roster with the power described as "Power: Electric, power from F7B MW8208" and similar entries. Was that rotary steam powered, and is the second railcar behind the rotary some type of power car?
Thanks for any info as these machines are quite interesting.
As for the steam coming from the plow set, I not really sure what that represents. My pure guess would be that the set retained steam heat and it comes from a steam generator in the B unit.
The following is a ink to an old Trainorders thread with some good technical information on the UP (SP) rotaries. For machines that are rarely used, they sure are fascinating beasts.
Link