The railway network of Great Britain is operated with the aid of a number of documents, which have been sometimes termed "technical manuals", because they are more detailed than the pocket-timetables which the public encounters every day. Historically, they were classified PRIVATE and not for publication, however since rail privatisation they are now more widely available, mostly in digital form, because they are produced centrally and not by the regional rail operators.
This body represents 26 train operating companies that provide passenger railway services
Network Rail owns and operates Britain's rail infrastructure
Also by Network Rail
The Office of Rail Regulation (ORR) produce a document Guidance on Infrastructure