Preserved EMU 306 017 occasionally gets out onto the main line as it did in the Spring of 2002.
It is seen here at Shenfield shortly before returning to London Liverpool Street. 
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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>