This particular loco 33103 seen here at Crouch Hill on the 22nd February 2005 was the one
used for a few days in 1999 to run push-pull services on this Barking to Gospel Oak Line. 
We should know because we took one of the last runs it made!
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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>