Harsig's Signalling Page 
Harsig's Signalling Page 

Last updated on
23rd March 2020



Harsig's Signalling Page

Welcome to

Harsig's Signalling Page

This website features a number of historical diagrams of London Underground Signalling and one or two other items of signalling interest.

Most of the diagrams are in PDF format and to open them you will need Adobe Acrobat Reader. If you do not already have this it can be downloaded from the Adobe Website.

Harsig's Signalling Page