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
  Bincombe Tunnel Map CM20
SY675864
SRS diagram L243
S3466 Bridport Map CG24
SY473934
SRS diagram L92
  Dorchester Station Map CM21
SY689892
SRS diagram D180 (West)
  Dorchester Junction Map CM21
SY690896
SRS diagram L243 (1960)
S3459 Evershot Map CL24
ST592041
SRS diagram D544
S3461 Grimstone Map CL22
SY641943
SRS diagram D180
S3460 Maiden Newton Map CL22
SY600980
SRS diagram B85 also W13/293 (1968)
  Portland Station Map CM19
SY682740
SRS diagram D30 not available (new box)
  Rodwell Map CM19
SY674783
SRS diagram D28 (1907, 1930)
  Upwey Junction Map CM20
SY671833
SRS diagram D304 (1917, 1961)
  Weymouth Junction Map CM20
SY677801
SRS diagram D523
  Weymouth Station Map CM20
SY678798
SRS diagram D523 also X43 (1957 SR Station box)
Prices are shown here.