Remarks: Nearing the end of their glory years, 'Forty-Chuck' number 610 gets 2149 underway out of their Mayfair stop and over the diamond of the UP (former C&NW) Northwest line on the near northwest side of the city. It wasn't much longer after this that all the MK MP36's started being delivered, bringing the gradual demise of these 'Milwaukee Road' commuter engines.