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CNJ Books Steam Diesel Freight CNJ Links Practice
Practice: Signalling

Lower quadrant semaphores  - thanks to Hank Sundermeyer

Lower quadrant semaphores used yellow blades with black stripes facing traffic.

Lower Quadrant:
Absolute Home signals had square ends and could have 1, 2 or 3 arms.
Aspects:
    RRR = Stop, all routes
    RRY = Restricting speed, usually a diverging route
    RGR = Clear, medium speed diverging route
    GRR = Clear, main or normal speed route.

Single arm signal used absolute on route with no divergence.
Aspects
    R = Stop
    G = Clear

    LQ Dwarf always meant slow/restricting speed route.

Permissive block signals:
2 Arms used in multi track regions.
    Upper Arm had pointed blade with point and was the block home arm.
    Lower Arm had fishtail blade and was the distant arm for the next block.
Aspects
    RY = Stop and Proceed at restricted speed
    GY = Approach, next signal at stop
    GG = Clear block

Single track regions used one arm block signals
    1 Arm block home pointed end
Aspects
    R = Stop and Proceed
    G = Clear

1Arm distant had fishtail blade. This signal did not convey block occupancy information.
Aspects:
    G = next signal Clear
    Y = next signal Stop.
 


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Last modified:  9 October 2016