I don't know if any of the Raritan River SW900s survive. But I was made privy a while back to a series of emails in a retired railroaders forum.
One of the former Conrail guys was sent from E'port Shops after the RRRR was gathered in to inspect their power. He said the units were beautifully maintained and he recommended to his bosses that yes, the RR power should not be sold or scrapped.
I remember him saying the units were sound mechanically, the prime movers were clean, excellently maintained. A lot of the original cab controls were in place too, just as they'd come from EMD. Even the tongue-and-groove wooden flooring in the cab was intact and in excellent condition. Believe it or not, he said the units had floor mats at the doors for crew members to wipe their feet before entering the cabs. Judging by the condition of the floors, those mats were used too.
Several months later, after the engines had been reassigned to Conrail service, he saw one in for a scheduled inspection at the E'port Shop. He said in just a few months the Conrail crews had managed to beat the living daylights out of the engine.