This is an over-head line testing coach which is being used on various lines out of London's Liverpool
Street Station using top-n-tailed class 37s which makes reversing easy. It is pictured at 
Chingford...where the good news is class 67s cannot go...on August 25th 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>