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 28 Dawley Map DM120
TQ086795
SRS diagram P296
S 60 Greenford West Station Map DQ124
TQ146840
SRS diagram D158
S 25 Hayes Map DN120
TQ098794
SRS diagram P296 (Hayes and Harlington)
  Northolt Map DP124
TQ131845
SRS diagram D158
S 61 Northolt Junction East Map DN124
TQ113853
SRS diagram P229 (1948)
S 62 Northolt Junction West Map DN124
TQ108856
SRS diagram P229
S 63 Ruislip and Ickenham Map DL124
TQ085867
SRS diagram not yet available
S 20 Southall East Station Map DQ120
TQ128798
SRS diagram not yet available
S 19 Southall East Junction Map DQ121
TQ134800
SRS diagram B254
S 21 Southall West Station Map DP120
TQ125798
SRS diagram D101
S 23 Southall West Junction Map DP120
TQ117795
SRS diagram D101
Prices are shown here.