Most of theK-28s were returned to Seattle and placed on the dock there, until they were sold at a War Assets Sale. I suspect that even if the RGS had wanted a pair of them, and could have actually used them, they could not have afforded to ship them from Seattle to Ridgeway.
Remember also that the Rio Grande really did not have any place for them either in 1946. No need for them between Salida and anywhere, could not run them through Black Canyon (which had better track than the RGS), the Chili line was gone, and Alamosa to Durango was not all that busy right after the war.
Thus even if they had been free it probably would not have even been economic for the Rio Grande to ship them back to Salida.
Something in my memory rings a bell that two of them wound up in Provo, Utah, but even that was apparently not close enough to make it worth it to the RG to buy them at the extremely low post war scrap prices, and ship them over their own railroad to Salida.