RISC OSMap of G.W. SignalboxesRISC OS
http://www.svrsig.org/gwmap/GWMap.htm
Sxxxx numberSignal Box nameView on map squareOther information including SRS diagram number
S 68 Beaconsfield Map CZ125
SU941911
SRS diagram P135
S 65 Denham East Map DI125
TQ052875
SRS diagram D159 (formerly West Loop)
S 66 Denham Station Map DH125
TQ042877
SRS diagram D159
S 67 Gerrards Cross Map DE125
SU998889
SRS diagram B230 (1924)
  Wilton Park Map DB125
SU967909
SRS diagram not yet available
Prices are shown here.