In 1987 radio electronic token block (RETB) was installed on all of the West Highland Railway system, except for the Fort William station area. RETB enabled safe operation of the long single line sections without signalling staff at stations; the control centre was at Banavie. The points at passing loops at stations were spring operated, and were negotiated at slow speed in the facing direction. To avoid confusion in radio voice exchanges between drivers and the signallers at Banavie, Mallaig Junction was renamed Fort William Junction while Tyndrum Upper station was renamed Upper Tyndrum - both from late 1989.