From memory a poster inside stated that this Gresley coach was the last of its type
to remain in service...possibly until the mid 1970's..and was also painted into Blue Grey. 
Pictured during the Great Central Railway's Diesel Gala in September 2004.
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Photo from James & Martin's Picture Collection Copyright 'Jampics' m.hawkes7@ntlworld.com 
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British and Foreign Railway Pictures <A HREF="http://jampics.fotopic.net/"> Jampics Fotopic.</a>