Somehow, perhaps it is the photo angle, but the white around those number boards has a different appearance. Sort of like a big steel plate was added, rather than being an integral part of the cab surface.
It was a "speckled" day. No, the white dots are not a photo flaw. It was just a standard spring afternoon snow flurry, as this helper unit idled at Elliston, Montana:
Iowa Interstate's heritage unit, 513, out on the lead of the Cedar Rapids "turn" at Fairfax, IA. 8/7/13 Iowa Interstate's heritage unit, 513, passing the former Walford Lumber Co. Walford, IA. 8/7/13 CRANDIC's new switcher, 1500XD(extreme duty) 201 and slugmate 301 shuffles cars around in the Penford holding yard. 8/7/13 CRANDIC's new power switching at Penford. 8/7/13