Can anyone elaborate on the deign, history and use of the semaphore signals at the top of Cumbres Pass? It appears that the semaphore was first installed on the depot until it was removed. It appears later in photos on the top of the section house. It looks like it has red and green lenses, but no yellow ones. Also it appears to be two of them mounted to the same post. I am trying to understand the positioning used so the one semaphore did not block the other while in use. Thanks in advance for your information and knowledge.
Jake Johnson