Signalling
The signal box, which had 15 levers, was situated on the island platform. From its opening in 1894, the West Highland Railway was worked throughout by the electric token system.
In 1967, the method of working between Crianlarich and Rannoch was changed to the Scottish Region Tokenless Block system. The Down loop at Tyndrum Upper was signalled for running in either direction and the signal box was able to 'switch out' when not required.
In August 1985, the method of working between Crianlarich and Rannoch reverted to the electric token block system. The semaphore signals were removed on 22 December 1985 in preparation for the introduction of Radio Electronic Token Block (RETB).
The RETB system was commissioned between Helensburgh Upper and Upper Tyndrum on 27 March 1988. On 29 May of the same year, the RETB spread north to Fort William Junction, resulting in the closure of Upper Tyndrum signal box (amongst others). The RETB is controlled from a purpose-built Signalling Centre at Banavie railway station. Upper Tyndrum station is the boundary between the two signalling interlockings and the areas of control of the two signalmen.
The Train Protection & Warning System was installed in 2003.
Read more about this topic: Upper Tyndrum Railway Station