LINKS AND REFERENCES

  • "ABCs of Railroading, Block and Interlocking Signals" by George H. Dury.
    Trains May 1992: pp.20-21.
     
  • "ABCs of Railroading, Getting the Signals Straight" by Frank W. Bryan.
    Trains November 1994: pp. 86-88.
     
  • "A Short Course in PRR Signals" by Bill Strassner.
    The Keystone Spring 1999, pp. 57-62.
     
  • "Understanding Railroad Signals" by Andy Sperandeo. 
     
  • Compendium of Signals  by Roger R. R. Karl. 
    Boynton & Associates : Clifton House, Clifton, VA 22024. 1971
     
  • All About Signals by John Armstron.
    Kalmbach Publishing Co. : Milwaukee, WI  53233. 1957
     
  • Signals by Craig Ingham
     
  • Lundsten's Basement
     
  • http://raildata.railfan.net/java/DivRte/NORAC.htm
     
  

   
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