Correct, those SD nines were 4450 and 4451 nicknamed Huff "N" Puff out of difference of there inability to maintain the schedule during peak commute hours, thus typically they were assigned to off peak hours and special passenger assignments.
Dave
SP's SD7s and SD9's were often "borrowed" for passenger trains, as most of them had steam generators, even if they did have switcher or Black Widow paint. Two SD9s were rebuilt in 1973-74 for reserve passenger duty, appearing on "Commutes", Amtrak trains, and SP specials.
Cotton Belt's PA1s also lacked nose signal lights and nose MU. Cotton Belt's GP7 also lacked dynamic brakes. On the FP7 the tradeoff was a bigger fuel tank than on SP's FP7s, since the hatch tank replacing the DB fan could be used for water.
SD sevens were ordered after Baldwin AS616 roadswitchers proved ill tempered and failure prone. One other odd ball Cotton Belt contender was FP7 307 painted in Daylight which lacked nose signal light and dynamic brakes unlike its SP cousins.
Oddly enough, they did have a lot of SD7s, though. I think these were ordered for branch duty, though; at the time, C-Cs weren't considered road power by most railroads.
2nd apologies not only was i in error on this, but this should have been on the locomotive thread, not here!
could not believe that SP had no GP7s!
Not only was 320 the only GP7 on the CB/SP roster it was the only geep delivered in Daylight colors and was equipped with a SG for passenger use, abit Daylight colors proved short lived before being repainted in Cotton Belts rendition of black widow.
this is meant as an apology to rcdye because the classic trains forum is down for repair. i realize now you did not tell me i had the correct answer but demanded further information.
i think the additional information is that the emd 1200hp switcher diesel and electricals with train heating boiler was mated to a-1-a trucks, as used onj e units, and this is why the locomotive was painted in daylight streamliner colors.
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