<p><b>Our Catalogue Reference:</b> ZSPC 11/256  
</p><p><b>Description:</b> Construction of tube at Mile End, showing 12ft diameter shield being driven round 7ft diameter pilot tunnel. Chemically consolidated ballast can be seen outside the 7ft cast iron lining through the opening in the shield
</p><p><b>Date:</b> c 1946
</p>
<b>Images reproduced by permission of London Transport Museum © Transport for London</b>
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