Was Farmington, NM identified as it had a stub on the tail of the wye also? It was used up to the end of the line in 1968.
The real reason for the demise of the stub switch was the pounding on the end of the rail, the alignment which changed over the year, but the main reason was the binding of the rails in hot weather. This was before the years of rail braces and modern rail clamp. The rail moved about a good bit and jammed the switch. Then a gang of track men had to lift a loose rail and use it like a battering ram to move one rail back and free the stub movement.
In just the past week, I rebuilt a stub switch and put a new stand on the long head timbers. We too had rail movement in the afternoon hot sun and had to cut off a 1/4 inch as we do not have the men for carrying a battering ram.