commentary on "poling" cars reminded me of the trip we made to the C&IM in 1966. Not only did they have a unique RS-1325
but they hauled coal for an interesting gravity driven coal dumper at Commonwealth-Edison's generating plant in Havana, Illinois.
This electric, battery powered, car "pusher" traveled on tracks parallel to the coal train and had an arm (visible here under the cab) which extended between the cars. It separated the couplers and the was capable of kicking the cars individually down the ramp into the rotary dumper. There they were spun, dumped. and pushed downhill, through a spring switch and then back to join the building string of empties.