Les and John:
The switch you refer to was a link into what was the South Yard, and was put there so they could recover the freight cars that would otherwise have been stranded. Some were put up on the North Yard, some were eventually moved up the line, but they had to be able to get that equipment out of there. The mainline was severed at the south end of the yard, so they couldn't have switched over to the track where the crossover was.
Beginning in 1968, the Silverton Trains came back into the Depot around the loop, which really cut down on the amount of switching at the end of the day. The D&S eventually went back to the old practice of pulling straight into the Depot Southbound, as they used to before the new loop was constructed.
Jerry, you and your friend (or anyone else) please feel free to contact me backchannel. I'll share whatever information I have. I'm also interested in modeling Durango at that time, and was fortunate enough to have been able to cover it in those days like a dog in a meathouse.
Mike
mike_trent_476@hotmail.com