The signalling system is all-electric, including the interlocking, semaphores being worked by solenoids sealed for outdoor use. All signals are weighted to return to 'danger' when the train has passed into the next track-circuit section. Points have a mechanism powered by the very reliable Ford Escort windscreen wiper motor that moves the blades and then locks and detects them, no detection means no signal! The few sprung points in the facing direction are also electrically detected with micro-switches to ensure closure after a train has passed through in the trailing direction.