101 issues of The Newsletter, the journal of the Society were published starting in the Spring of 1970 and ending in 1986 after which the Society journal adopted a new name.
Included in the Newsletters were articles about signalling, signalling centres, signalling changes and Society news together with diagrams. In the later issues some photographs were included as well.
Some of the information is unlikely to have been published elsewhere.
You can download an Index to the Newsletters free of charge.
As the Newsletters were mostly duplicated the quality is a little variable.
The Newsletters are the © copyright of the Society and are sold to the terms of the Licence Agreement set out in the Terms and Conditions which can be accessed at the bottom of this page.