CGMRC Automatic Block Signaling
Rule Aspects Name Indication
Color Light Semaphore
240-A
Red		 Semaphores will be later Stop. Stop
240-D
Yellow		 Approach Proceed prepared to stop at next signal. Train exceeding medium speed must at once reduce speed to that speed.
240-F
Flashing Yellow
on any Signal
Flashing Approach Medium Proceed; approach next signal at medium speed
240-E
Green		 Clear Proceed at prescribed track Speed
240-N
Flashing Red
on any Signal
Restricting Proceed at restricted speed without stopping. Train is leaving signaled trackage. (In lieu of Lunar signal)
See Rule 27
Dark		 Dark - Stop Signal Imperfectly Displayed


General Usage of Multi-Head Signals
  1. The "High Signal" will govern movement on the Main Track.
  2. The "Middle Signal" will govern movement on the secondary, or medium speed route. (Example: A main line crossover from one main to the other.)
  3. The "Low Signal" will govern movement to the low-speed route. (Example: Entering a siding.)

Special Usage of Multi-Head Signals are explained in the following section of the signal rules, on a case by case basis.
  1. Westbound at East Madras, and Eastbound at West Madras:
    1. Middle Signal governs movement into Madras Track 2.
    2. Low Signal governs movement into Madras Track 3.

  2. Eastbound at West Maupin:
    1. Middle Signal governs movement into the Maupin Reverse Loop.
    2. Low Signal governs movement into Maupin Siding

  3. Eastbound at East Maupin
    1. Low Signal governs movement into the Maupin Reverse Loop.

Rule 27 - A signal imperfectly displayed, or the absence of a signal at a place where a signal is usually displayed, must be regarded as the most restrictive indication that can be displayed by that signal.




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