Shunting signals or dwarf signals are destined to guide shunting movements only. Every engine can be set for shunting purposes, but special engines are better equipped to do the shunting job.
To regulate safe shunting, special signals are installed to guide shunters properly on their job. However the speed is low and restricted, an accident can still occur during shunting causing a derailment.
Absolute shunting signals:
When a shunting signal shows a red beam on a white disk or a red/white and either red/red light combination, then any shunting movement beyond the signal is strictly forbidden in any circumstances. Unless the signal is malfunction, then the proceeding restriction is given by warrant or radio order directly from the signalman or CTC
A red light horizontal next to a white light.
Two red lights horizontal next to each other.
The shunting disc shows a absolute stop signal. The signal remains in an absolute stop aspect independently the aspects of a main signal. If the main signal shows a clear aspects the shunting signal still shows an adverse signal aspect.
Unlike other railroad companies. the route which are set could show a cleared shunting aspects, however the meaning of a cleared shunting signal does not tell the driver to proceed.
A white shunting signal indicates the points are set instead of permission to proceed.
Permissive shunting signals
When a shunter signal shows a yellow beam on a white disk or a yellow/white and either yellow/yellow light combination you are allowed to maintain shunting in certain circumstances.
When you have to continue to shunt to another yard, siding or headshunt directly ahead of you without crossing or endangering the mainline you are then allowed to continue.
A yellow light horizontal next to a white light.
Two yellow lights horizontal next to each other.