Railroad Rules, Signalling, Operations:

North American Signaling

by Carsten S. Lundsten.

SP-style ABS simulator added December 22, 2011
Pittsburgh & West Virginia signal aspects and indications added February 20, 2013
Pittsburgh & West Virginia Poor Man's CTC added May 20, 2014

North American Signaling documents

     Basics of North American Signaling and Safety principles
     Basic principles of Automatic Block Signaling, Interlocking, Traffic Control Systems and Centralized Traffic Control

Track Occupancy Control Systems
     Track Warrant Control (TWC)
     Direct Traffic Control (DTC)

Automatic Block Signaling systems
     Southern Pacific single track Automatic Block Signaling
            Simulator for SP-style ABS on the Central Oregon & Pacific - added December 22, 2011
     Absolute Permissive Block signaling
     AT&SF double track Automatic Block Signaling
     AT&SF "Flat Pair" single track Automatic Block Signalling

Centralized Traffic Control systems
     Pittsburgh & West Virginia "Poor Man's CTC" - new May 20, 2014

Signal Aspects and Indications
      Atchison, Topeka and Santa Fe, 1995
      Bessemer & Lake Erie Railroad, 1957
      Kansas City Southern, 1998
      Pittsburgh & West Virginia, 1953 - added February 20, 2013
      Southern Pacific, 1996
      Union Pacific, 1988

Comments, corrections and more information is very welcome. Please use this contact form


Text, Images except for wallpaper, HTML: Carsten S. Lundsten.
Wallpaper photo: Kindly by Eric Schmelz, modified by Carsten S. Lundsten