"A combined-volume reissue of the IRSE 'green booklets' no. 14. Multiple aspect signalling - no. 15. Circuits for colour light signalling - no. 16. Holding the route - no. 27. Signalling the layout."
Title from cover.
Individual booklets originally published: 1949-1969.
British Railway signalling practice. Multiple aspect signalling. ISBN 0902390198. Published by IRSE in 2005. Publication and catalogue information, links to buy online and reader comments.