| Technical drawing numbers | |
| S187/1 | Record of amendments |
| S187/2 | Locking sketch |
| S187/3 | Mechanical locking table |
| S187/4 | Detection table |
| S187/5 | Electrical control table |
| S187/6 | Dog chart |
| S187/7 | Lever leads |
| S187/12 | Signal box diagram |
| ‹‹UP Click below to move to adjacent box DOWN›› | ||
| Colthrop Siding | —— This box —— | Thatcham West |
The diagram below is a low-resolution version to indicate the content: a full-resolution 'pdf' file will be published on a CD-ROM entitled 'Great Western Railway Signal Box Diagrams - Section A'. For availability and ordering information, click on the image below.
This page last updated on 5th February 2010.