I travel the Southwest Chief a lot and here is what I observed on my most recent trip in October 2015:
WigWag
Wigwag at Delhi is alive and well. Observed it operating as we passed by on #3.
Semaphores
I made notes in my timetable on where the semaphores were located as we passed them.
Note the mileposts and location names could be off as I'm using a Southwest Region Timetable from 1997 for location names.
Semaphores between:
MP 710.0 Colmor - MP 767.7 Arriba
Semaphores between:
MP 778.5 Ojita - MP 793.6 Blanchard
Semaphores between:
MP 843.4 Detector - MP 852.2 Los Cerrillos
Here's a pic I took of one of the semaphores from the moving train. (photo taken on a February 2013 trip):
I have other photos from my various Amtrak and Southwest Chief trips here if anyone is interested:
Train Photos
Matt
Lake Forest, CA
Click Here for my model train photo website