NKP -
NICKEL PLATE ROAD
SIGNAL ASPECTS
RAILFAN GUIDES HOME
RAILROAD SIGNALS HOME
Chart from the Yahoo Railway Signaling group in the files section, scan courtesy Dennis F. I don't know from what date or era the chart is from, obviously post semaphores tho.
Click
here
for the PDF version.
New 28MAY2012....
Last Updated: 11/29/2016