A 'Sixty in the Sun'. We know that it is a Mainline grey one, and that it is on the Wolverhampton to Hoo Junction steel train. Where... at Didcot Parkway on Tuesday March 18th 2003. As for the number though, we don't know that for sure. Slacking on the job I'm afraid! 
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Photo from James & Martin's Picture Collection Copyright 'Jampics' m.hawkes7@ntlworld.com