Installing a servo-driven semaphore signal at Colfax
Channel: Model Railroad Hobbyist magazine
Date: 2012-03-03

http://mrhmag.com: Duncan McRee shows how he installed and operates a lower quadrant semaphore on his Southern Pacific based Tam Valley model railroad layout. Duncan developed the electronics to drive a 3-position semaphore using inexpensive model airplane servos. This video shows the semaphore installation and operation. Companion to the March 2012 issue of Model Railroad Hobbyist magazine -- http://mrhmag.com