The different appearence of the Circle/Hammersmith and City Lines C Stock dating from 1969 on the left and the 
Metropolitan Line's 1960 A Stock on the right can be seen in this picture taken at Farringdon on the 9th November 2007.
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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>