The Yellow Book is
no longer being maintained. Yellow Book Issue 4 has the status of a withdrawn
document and does not represent up-to-date guidance for the GB mainline railway.
Yellow Book issue 4 continues to be available for organisations to use if they
wish, but all organisations should note that the guidance contained within it no
longer aligns with the current regulatory regime that applies to the GB mainline
railway system.
Work is currently underway to provide updated guidance.
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