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These detail parts are required to complete a signal and contain 2 siding signal arms and 2 Shunt Ahead signal arms. Also required to complete this signal are 0.015" phosphor bronze wire and several small screws that are readily available.
Shunting signals are:
• controlled signals, operated by Signallers or other Qualified Workers, and
• used to authorise shunting movements.
The front of a semaphore shunting signal arm is red, usually with a longitudinal (along its length) white stripe. The back of the arm is white, with a longitudinal black stripe.
Multiple semaphore shunting signals are usually mounted one above the other on the same post.
The highest signal on a signal post is for the leftmost route. The next signal down is for the route immediately to the right of the first route, and so on.
If placed below running signals, small semaphore signals are subsidiary signals.
If the subsidiary shunting signal displays PROCEED, the running signal displays STOP.
Siding signals are used to control movement from sidings to main lines or vice versa, and can be used within sidings, as well as from one running line to another
Shunt Ahead signals
• are fitted as subsidiary signals to starting signals or home/starting signals, and
• authorise a shunting movement past that signal and within the section only.
Shunt ahead signals must not be used as an authority to proceed through a section.