The position of the blade and the color of the lens lets the train crew know how to proceed down the track. This blade indicates a green with the blade pointed up.
In New Mexico you can find some of the last semaphores still in main line service near Las Vegas, New Mexico. This group stands at the west end of the siding in Chapelle, New Mexico. There are three more at the east end of the siding.
Intermediate signals in Bernal, New Mexico which is west of Chapelle, NM
Wagon Mound, NM