Now this is not something you would see in the U.K. unless a train was assisting a failure.
Electric loco 1723 is providing motive power from the middle of this 8 coach double-decker train pictured
at Dordrecht on the 3rd June 2004.
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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>