Signalling a change at Notarb

New signals waiting their turn at Notarb on the UP (former Southern Pacific) tracks 20 miles timetable west (compass North) of Fresno, CA in May, 2011. These signals are at one end of a CTC-controlled siding (note the head-over-head arrangement of the older signals). The current searchlight-style signals have a signal pole line connection to their control box while there is a wireless antenna cabled to the box for the new Type D signals. More photos in Layout Design Journal #43: http://www.ldsig.org/publications