Amtrak’s “SouthWest Chief” dusts it’s way across the New Mexico desert, thanks to new ballast stones laid on the track that morning. This old Santa Fe rail line across New Mexico and Arizona is seldom used for freight traffic, which goes on the more northerly “Transcontinental” mainline. But once per day this train runs south from Denver and over Raton Pass, NM into the Sonoran desert. This is the last Class 1 railroad mainline in the USA to still use operating semaphore signals like this. The past lives on in the desert SouthWest.
http://www.railpictures.net/viewphoto.php?id=577848