A wagon based on a design used at the site and possibly used for the transportation of explosives.
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Royal Gunpowder Mills Waltham Abbey May 28th 2005
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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>