Amtrak's westbound Southwest Chief races through semaphore intermediates along Interstate 25 just outside of Wagon Mound, New Mexico on July 20, 2015.

Clouds build in the New Mexican sky as Amtrak No. 3 rounds the curve at the intermediates in Valmora just east of Watrous. Tri-light signal replacements have been installed, but are not in service... (more)