Technical drawing numbers
S1820/1Record of amendments
S1820/2Locking sketch
S1820/3Mechanical locking table
S1820/4Detection table
S1820/5Electrical control table
S1820/6Dog chart
S1820/7Lever leads
S1820/12Signal box diagram

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Hirwaun Pond  ——  This box   ——  Rhigos Colliery

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 - South Wales'. For availability and ordering information, click on the image below.

This page last updated on 8th October 2010.