Later that same day he sent more:
"Two other details to note:
"1605-1612 came at a time when C&NW was equipping all of their road power with large Red Mars warning lights---I refer you to engines 1556-1599, 1601-1603, 1604 and 1613-1618. I believe that protruding sheet metal above the front headlight on all of the F-M's in the 1605-1612 series was actually a mounting platform bracket for that large red warning light. If you look in Paul Wither's "Diesel Locomotives Of The Chicago & North Western", there are two photographs of sisters of this series that plainly show an electric receptacle mounted on the Loewey headlight mount, in position for plugging in the Pyle or Mars red warning light.
"Since the large warning light was in vogue on C&NW's Locomotive purchases in the same time period as the series of engine noted above, I can only fathom that the protruding sheet metal on the fronts was actualy a mounting bracket. I have never seen a builder's photo of 1605-1612, only shots made of these engines much later, so I can only speculate if this series ever received the red warning light. My guess is no, but that they were equipped for it.
"Second worthless point:
"It would appear that 150 and 1510-1514 came WITHOUT MU capability. A head-on photo of # 150 in a Trains Magazine Article shows 150 in service without MU; Builder's photos of 1510 show it without MU. By 1960, all were MU equipped---ELECTRICAL MU equipped.
"I bring that Electrical point up because from another old photo of C&NW 1672 showing Westinghouse Air MU receptacles in a photo in Kalmbach's "Locomotive Cyclopedia 2, DIESEL LOCOMOTIVES", showing 1672 & sister pulling towards the camera with the oblong Westinghouse Air MU schedule recepticle and high-mounted air hose for that schedule plainly visible.
"Once again, by 1960, these engines were equipped with Electrical MU plugs.
"A page from a C&NW Locomotive Diagram book noted that engines 1668-1671, 1673 incl., had "Electro-pneumatic Throttles", which would be the Westinghouse Air Throttles, the same type used on Baldwin Locomotives.
"C&NW must have reworked the throttle schedule on these engines, going from Electro-pneumatic to all electric. I can't guess when this was done, but it seems to have been around the 1959-1961 time period. By the mid-1960's they are paired with any manufacturer's locomotives and sport electric MU receptacles versus the oblong Westinghouse MU plug."
Keith
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