From the time of its opening in 1901, the Mallaig Line was worked throughout by the electric token system.
Mallaig signal box was situated south of the station, on the east side of the line.

On 14 March 1982, the method of working on the section between Arisaig and Mallaig was changed to One Train Working (with train staff).
Mallaig signal box was closed as a token station, but retained as a ground frame with four levers.
All the semaphore signals were removed.

On 6 December 1987 the Radio Electronic Token Block (RETB) system was commissioned between Mallaig Junction (now called 'Fort William Junction') and Mallaig.
The RETB is controlled from a Signalling Centre at Banavie railway station.

In November 1992, the former signal box was demolished and replaced by an ordinary ground frame.

The Train Protection & Warning System was installed in 2003.
From the time of its opening in 1901, the Mallaig Line was worked throughout by the electric token system. Mallaig signal box was situated south of the station, on the east side of the line.
On 14 March 1982, the method of working on the section between Arisaig and Mallaig was changed to One Train Working (with train staff). Mallaig signal box was closed as a token station, but retained as a ground frame with four levers. All the semaphore signals were removed.
On 6 December 1987 the Radio Electronic Token Block (RETB) system was commissioned between Mallaig Junction (now called 'Fort William Junction') and Mallaig. The RETB is controlled from a Signalling Centre at Banavie railway station.
In November 1992, the former signal box was demolished and replaced by an ordinary ground frame.
The Train Protection & Warning System was installed in 2003.
Mallaig railway station