Up until March 2004 this was a regular sight class 47s top-n-tailing Serco Test trains.
This pair were seen at Pudding Mill Lane Bow E.London in the Summer of 2002 with a rather faded looking
47759 leading the way on its journey into East Anglia.
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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>