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The Biggest Bore

Sky Ditch Eye Hole

Mike Kelly boring, bore, architecture jobs...

Fillie the Farnworth tunnel boring machine is officially the biggest bore.

Fillie 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).


“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.

The reconstruction of the Farnworth tunnel is an important stepping stone towards creating an electrified railway between Manchester and Preston and is part of more than £1 billion of investment by Network Rail to improve rail services across the north; electrifying key routes, creating new rail links, improving stations and journeys.”


Acknowledgements: The full article can be read at: