The biggest tunnelling machine in Britain has started work near Bolton as part of a Network Rail project to electrify one of north-west England’s busiest rail routes.
At 9m in diameter at its cutter head, Fillie the Farnworth tunnel boring machine is bigger than the machines used to build London’s Crossrail (7.1m), the Thames Tideway ‘super sewer’ (8m) and even the Channel Tunnel (8.8m).
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