That era seems a little early for 'leased' locomotives, and the Santa Fe was never a power short railroad, at least to the best of my knowledge. You may have seen different 'Pool' power or run-through power from different railroads on the Santa Fe during this time however. Welcome to Trainboard also!
I've always been a fan of both Santa Fe and Rio Grande so I decided to model both running out of Pueblo, CO around 1970. I have Santa Fe running East to LaJunta and Rio Grande West to Canon City. In Santa Fe I have (2) blue and yellow (GP30 & CF7) and (1) black H16-44. I also have a Kodachrome Santa Fe (GP30) which I cannot now use in the 1970 era. So, I want to add more Santa Fe locos but I do like variety so thought maybe I could "lease" something else if I can find the right thing in DCC sound. Jerry
There was a time in the late 70s or early 80s when they leased a number of Chessie GP40/-2s to help a power shortage. But in the 60s or 70s... I'm not quite sure where to research this.
McMillan's "Route of the Warbonnets" is a great 70's era book, although black and white, and he has pictures of some odd run-throughs, to be sure, that I didn't think existed. I'm remembering MP and CN shots, I think. As Road Foreman of engines, if Joe didn't know it, nobody did. ATSF was a good one for demonstrators, though. They ran Alco C636's, didn't buy them. Remember the times. 1972 was the most profitable year ATSF had had in a long, long time, due to the Russian grain moves. They took orders on 100 U36C's starting in early '72. SD45-2's were arriving. The CF7 program was gearing up to wide-open. The SD39's were delivered. The SD24 rebuild program was starting, too, in 1973. ATSF leased their F-units to Amtrak, remember, and that's not the action of a power-short road. Smart move though, if you want your FP45's back!
I rememeber watching Piggyback trains coming through CA in the 80's with Chessie power mixed in with the ATSF power.