Google Map of the Extent of the Severn & Wye Railway - c1900
This a custom-generated Google Map of the extent of the Severn & Wye railway. The green line is the current extent of the Dean Forest Railway,the orange line represents a possible (and as of January 2016, looking more likely) northwards extension towards Speech House Rd and the cyan lines show closed sections which are likely to remain that way. Blue location markers represent stations, magenta represent collieries and other major suppliers of freight and green represent tunnel entrances and other sites of interest.
I'm not claiming the additions I've made are 100% accurate, but I'm hoping that based on the map data, the aerial images, and the pictures I've seen, the lines and markers illustrated are reasonably close to their actual positions in reality. It should also be noted that the lines drawn do not necessarily mean that any public right of way exists along them (although a lot of them are now cycleways).
I have also tried to link the location markers to some of the publications referenced by this site in order to show where locations are (or at least approximately were located).
PPC1 : Past and Present Companion, The Dean Forest Railway and ex-Severn
& Wye Railway Lines Volume 1
PPC2 : Past and Present Companion, The Dean Forest Railway and ex-Severn & Wye Railway Lines Volume 2
SW1 : Severn & Wye Railway Volume 1