Spot the signal!  The downside of semaphore signals is shown here, 
in this view down the track towards Dyce station from the north.  
Lineside clutter in urban areas makes semaphore arms hard to see.   At night, 
the feeble illumination of traditional signals makes their observation 
a real challenge... 

Photo by Bill Harrison (bill.harrison@dsl.pipex.com)   3 March 2007