"This latest version of the guidance ... revises and updates the previous advice contained in the Railway construction and operation requirements for passenger lines and recommendations for goods lines documents which became known throughout the industry as The blue book or simply the Requirements"_Foreword.
Publisher's no. HS(G)153/5.
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Railway safety principles and guidance. ISBN 0717609537. Published by HSE Books in 1996. Publication and catalogue information, links to buy online and reader comments.
