| Technical drawing numbers | |
| S186/1 | Record of amendments |
| S186/2 | Locking sketch |
| S186/3 | Mechanical locking table |
| S186/4 | Detection table |
| S186/5 | Electrical control table |
| S186/6 | Dog chart |
| S186/7 | Lever leads |
| S186/12 | Box diagram |
The dog chart and associated locking table, derived from the dog chart, show the situation in 1970. The redrawn dog chart and the associated lockin g table, derived from the dog chart, show the proposed situation in 1971, to allow disc 12 to read to three routes. In fact disc 12 and associated connections were removed in mid 1971. The box diagram has been published in 'Signal Box Diagrams of the GW and SR' by Pryer, volume 20 and in 'GWR Berks and Hants Lines', page 20. Renamed 'Colthrop Crossing' w.e.f. 1999.",
| ‹‹UP Click below to move to adjacent box DOWN›› | ||
| Midgham | —— This box —— | Thatcham |
The diagram below is a low-resolution version to indicate the content: a full-resolution 'pdf' file has been published on CD-ROM (GW Section A). For availability and ordering information, click on the image below.
This page last updated on 5th February 2010.