THE SIGNAL BOX

SIGNALS

SEMAPHORE SIGNALS

4. Shunting signals

Signals used for shunting purposes are distinct from stop signals as their function is different. They do not indicate that the line ahead is clear, but that movements may proceed as far as the line is clear.

Shunting signals are in the form of a miniature semaphore arm, mounted at ground level or on a signal post. Many of those at ground level have the arm superimposed on a white or black disc to aid visibility. This type is generally called a disc signal.

Semaphore shunting signals

Miniature arm shunting signal (lower quadrant) Miniature arm shunting signal (somersault) Miniature arm shunting signal (upper quadrant)

Signals such as these are sometimes used in place of Stop signals on low-speed goods lines. This gives the same authority to enter the section as a calling-on signal would.


Elevated position light signal
Lower quadrant Somersault Upper quadrant Colour Light

Ground disc signals

Disc signal (lower quadrant) Disc signal (upper quadrant)

Ground signals are mounted at ground level - you'd never have guessed!

Their meaning is exactly the same as the miniature-arm signals above.


Ground Position Light signal
Lower quadrant Upper quadrant Colour Light

Yellow shunting signals

  Yellow-armed miniature arm shunting signal (upper quadrant)

Shunting signals with yellow arms (with, sometimes, a black band) are usually found at the outlet of sidings where there is also a headshunt.

Signals of this type should not be confused with Distant signals, as their purpose is quite different. The function is similar to that of the red arm shunting signal, with one additional feature. It may be passed when on for shunting movements along the headshunt. This saves frequent operation of the signal when shunting is taking place.


Elevated position-light signal (yellow light)
Yellow-armed ground disc signal (lower quadrant) Yellow-armed ground disc signal (upper quadrant)  
Yellow-armed ground disc signal with black background lower quadrant) Yellow-armed ground disc signal with black background (upper quadrant) Ground Position Light Signal (yellow light)
Lower quadrant Upper quadrant Colour Light