The only reason I know this machine is a 'stoneblower' is that it is conveniently written on the side!
This Pandrol & Jackson machine made an impressively 'claggy' departure from the signal as it set off
from Stratford E.London on April 1st 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>