Prototypical working with full track circuiting and accurate signalling remains the key to the railway's operation. The two termini are controlled by semaphores while the whole of the main line is equipped with colour-lights, 10 of these being automatic. The boxes at Hardwick Central and Everglades Junction are fitted with Westinghouse 'L' type frames with, respectively, twenty-three and thirty-one miniature levers. The former was once part of the 227-lever installation at Crewe South junction while the latter is the complete frame from South Croydon Junction. The country terminus, Cockcrow Hill, has a 16-lever full-size 'knee' frame manufactured by the Railway Signal Company, probably around 1930. It came from the Waterloo terminus of the Waterloo & City line.