The 'Royal' class 67s do turn up on freight duties  at times and this is an example. 
67006 'Royal Sovereign' brings the Dagenham  Dock to Wembley car train through
Gospel Oak on the 2Oth July 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>