Signalling
From its opening in 1901 the Mallaig Extension Railway was worked throughout by the electric token system. Glenfinnan signal box, which had 15 levers, was at the east end of the Down platform, on the south side of the line.
On 13 November 1983, the method of working from Glenfinnan to Mallaig became One Train Working (with train staff). Electric token block was reinstated to Arisaig on 29 April 1984, but One Train Working continued to be used when Arisaig token station was switched out. The Arisaig - Mallaig train staff would then be padlocked to the Glenfinnan - Arisaig key token.
Glenfinnan lost its semaphore signals on 13 April 1986, in preparation for Radio Electronic Token Block (RETB) signalling. RETB was commissioned between Mallaig Junction (now 'Fort William Junction') and Mallaig on 6 December 1987. This resulted in the closure of Glenfinnan signal box (amongst others). The RETB is controlled from a Signalling Centre at Banavie railway station.
The Train Protection & Warning System was installed in 2003.
Read more about this topic: Glenfinnan Railway Station