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 or USB flash drive in the format presented here. Additional information, such as amendment state, locking table etc., is being added where available.
Diagrams and documentation for 261 boxes in Section B (Bristol Division) of the Great Western Signal box register are included on this flash drive (280 diagrams in all). Changes since this CD was published in March 2010 are shown highlighted (thus).
