Real trains and not just units still visit Chingford occasionally. Here we see DRS 37069 on the front
of a Serco operated Network Rail Test Train waiting to return to  London Liverpool Steet on the 27th of
January 2009.
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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>