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.
Glenfinnan's semaphore signals were deactivated on April 13, 1986, to make way for Radio Electronic Token Block (RETB) signaling. RETB was implemented between Mallaig Junction and Mallaig starting December 6, 1987.