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Are all fefers mechanical in the sense that powered by a fuel motor or are there any powered by a driveshaft generator from the axle? I've seen this on Italian refers (interfrigo), also seen cabooses in North America with the machanism (generator ). I would guess if you had 60 refers like this you may need an extra unit to pull the train just for the drag. If it was an electric train like in Italy it would mean the refer is electicaly run from the overhead, indirectly. Wouldn,t this kind of refer with a drive off the axle be lower maintanence? Surely refer cars don't sit around so long as you would need a motor powered cooling?
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