The SRS Drawing Office collection of signal box diagrams has been built up over many years and constitutes hand-drawn sketches of the layout controlled by a signal box, with signals and connections numbered. It contains the information that would be included on the signal box diagram displayed in the box. The collection is being digitised and published on CD-ROM in the format presented here. Additional information, such as amendment state, locking table etc., is being added where available.
Diagrams and documentation for 175 boxes in Section A (London Division) of the Great Western Signal box register are included on this CD (195 diagrams in all) occupying most of the capacity of the CD.
