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Arley is one of two signal boxes on the SVR that can be switched out, the other being [[Hampton Loade signal box|Hampton Loade]]. When the box is switched out the Down Loop cannot be used. Arley and Hampton Loade are also the only signal boxes on the SVR that are 'crossing places' as per the ETT regulations.
Unusually, when the box is switched out the yard can still be accessed, by operating the signal box lever frame as a ground frame. An intermediate token instrument is provided inside the P.Way hut to enable trains to be locked into the yard. One side effect of this operation is that whilst the yard is being shunted, the Highley and Bewdley North signalmen are unable to communicate by bell signal.
Arley is the only SVR signal box the electrically locked levers of which are operated by the lever catch handles, so the signalman does not have to push a separate release plunger.
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File:Arley token instrument.jpg | The intermediate token instrument
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== History ==