Looking as if they have had a recent paint job the LT Ballast wagons would appear to be of the 'HW ' type the nearest
one being numbered 207. Pictured at Roding Valley on the Central Line during nearby track relaying in March 2006.
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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>