RISC OS S.V.R. S&T Department RISC OS
http://www.svrsig.org/ diags/S830.htm

Exeter East

Exeter East documentation is based on a dog chart at revision G, marked up to show levers 5, 6 and 7 becoming spare and an electric lock having been added to FPL 26, although the 'each way' locking remains. A box diagram shows the layout controlled by this box, many connections and signals being controlled from Exeter Riverside box, as indicated. I have included a hand drawn box diagram to show the position at this time.

Box diagram

The dog chart for this frame is included as well as a locking table derived from this dog chart.