Only the earlier 'Choppers' had the circular headcode discs unlike later class 20's
which were fitted with panels. 20001 and 20227 are working in multiple providing us
with plenty of that 'class 20 sound'.
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Sunday 15th May at the Mid-Hants Diesel Gala 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>