Signalling
PRYER, G.A.
Signal Boxes of the London & South Western Railway - A Study of Architectural Style
Oakwood Series X68
PULLEYN, Richard
Signalling Centres in the North-East - York from Early Days to Rail Operating Centre
Signalling Centres in the North-East No. 1
SIVITER, Roger
Semaphores & Diesels
Yesteryear Traction Series
Album of fine colour photographs of diesels and signalling across the country in the 1970s and 1980s. One of a series produced by the author as Yesteryear Traction (use this term to search for other volumes).
Southern Railway
Standard Regulations for Train Signalling on Double and Single Lines, including signalling instructions, etc. to operate on and from 2nd February 1930
SUCH, W. H.
Mechanical and Electrical Interlocking (British Practice)
The Institution of Railway Signal Engineers Booklet No. 3