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 356 Chiseldon Map CY45
SU188798
SRS diagram B108
S 196 Kintbury Map DC42
SU387672
SRS diagram P312
  Marlborough Map CY43
SU192686
SRS diagram not available
  Marlborough Tunnel East Map CZ42
SU196671
SRS diagram D89
  Marlborough Tunnel West Map CZ42
SU190682
SRS diagram D89
S 358 Marlborough Low Level (M.S.W.) Map CZ43
SU194686
SRS diagram P141 also L218 (1929)
S 357 Ogbourne Map CY44
SU202745
SRS diagram P141
Prices are shown here.