Well, I'm not even close to being a Conrail modeler.
But I did live on the Southern Tier line (west) between 1983 and 1992, on the ex-EL main at Waterboro Jct.
As soon as the SD50's came out, a pair was the standard power on ELOI and OIEL, the only two through trains we had. For some odd reason, I'd heard that the STW was 'unusual' in that respect, hanging onto the SD50's longer than most areas, just like we held onto cabooses longer. When through traffic was cut in 1991, that was one more good reason to move. But I'll admit, a pair of those units back-to-back was every bit as 'pretty' as E-L paired SD45's that I saw in the 70s'. They were usually clean, well-maintained, and photogenic. I sure took a lot of shots of that time.
But I'll also be honest. I couldn't tell you trucks, fans, anticlimbers, whatever. They were just the 6700's, and they were pretty much all we had!