RISC OS S.V.R. S&T Department RISC OS
http://www.svrsig.org/ diags/S224.htm

Oxford Station South

The dog chart and associated locking table, derived from the dog chart, show the position as at 22 December 1947 when lever normal contacts on levers 3, 4, 6, 7, 9, 10, 52 and 56 were added. The box diagram has been published in 'The Heart of the Great Western by Adrian Vaughan, OPC, page 158'.