The only part of the London Underground system that has this additional safety feature
between the platform edge and the line is the most recent addition...the Jubilee 
Line extension between Waterloo and Stratford. An eastbound train is seen here arriving
at Waterloo in the Summer of 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>