Colthrop Siding

Technical drawing numbers
S186/1Record of amendments
S186/2Locking sketch
S186/3Mechanical locking table
S186/4Detection table
S186/5Electrical control table
S186/6Dog chart
S186/7Lever leads
S186/12Box 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.