Investigation of the "Down" Tunnel found deformation and cracking of the lining and this was reconstructed during 11 weekend possessions.
The "Up" Tunnel was filled with low strength concrete and a 9m diameter open face shield was used to construct an 8m diameter segmental lined tunnel whilst traffic was maintained in the "Down" Tunnel.
Tea and biscuits will be available at 5.30pm
Advance booking not required
The event will be followed by a social in the ICE bar sponsored by J. Murphy & Sons Ltd, OTB Engineering Ltd and Network Rail
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