That mineral red paint is a good sign that the locomotive was converted into a power unit for the electric powered rotary snowploughs.
These units did not provide tractive force to move the plow. Just power for the motors that ran the blades and auxilliaries. I would imagine that the locomotive had the powered axles replaced with idlers but they could have been put back in in the warm months so the locomotive could be put back to work pulling frieght rather than just setting in the roundhouse all summer. I know the BN later put B units with the rotaries and they stay with the plow all year long.