Railroad Rules, Signalling, Operations:

North American Signaling

by Carsten S. Lundsten.

AT&SF single track "Overlap" Automatic Block Signaling (later version from ca. 1960) document added December 10, 2021
Milwaukee Road Absolute Permissive Block Signaling (electrified lines) document added December 13, 2021


North American Signaling documents

Basics
     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
    Overlap style single track Automatic Block Signaling systems
         Southern Pacific single track Automatic Block Signaling
                Simulator for SP-style ABS on the Central Oregon & Pacific
         AT&SF "Overlap" single track Automatic Block Signaling, original (1920s) version
         AT&SF "Overlap" single track Automatic Block Signaling, current version (1960 and later) version - new December 10, 2021
         Chicago, Milwaukee & St. Paul Railroad (Milwaukee Road) single track Automatic Block Signaling on electrified lines, original installation
    Absolute Permissive Block style single track Automatic Block Signaling systems
         Classic Absolute Permissive Block signaling
         Pennsylvania RailRoad Absolute Permissive Block Signaling
         Illinois Central Cab Signal based Absolute Permissive Block Signaling
         Chicago, Milwaukee & St. Paul Railroad (Milwaukee Road) Absolute Permissive Block Signaling on electrified lines - new December 13, 2021
         AT&SF "Flat Pair" single track Automatic Block Signaling
    Double track Automatic Block Signaling systems
         AT&SF double track Automatic Block Signaling

Centralized Traffic Control systems
     Pittsburgh & West Virginia "Poor Man's CTC"

Signal Aspects and Indications
      Atchison, Topeka and Santa Fe, 1995
      Bessemer & Lake Erie Railroad, 1957
      Kansas City Southern, 1998
      Pittsburgh & West Virginia, 1953
      Southern Pacific, 1996
      Union Pacific, 1988
      Western Maryland, 1973

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