Located in the middle of the 4 mk2 coaches is the Railtrack...now Network Rail...overhead
wire testing coach. Seen here at Stratford E.London in the Summer of 2002.
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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>