We only saw this unit once and no other stock looked like it so we think it could have been some kind of test train.
Pictured at Budapest on the 17th October 2005.
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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>