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Crossrail's smallest tunnelling machine launched

Molley, the smallest tunnel boring machine in Crossrail’s inventory with an internal diamter of 1.45m, is building a new Thames Water sewer in west London as part of the new rail line.

Molley will build a new 564m tunnel to divert a section of the Great Western Road sewer between Westbourne Park station and Basing Street, under Tavistock Road.

The sewer needs to be redirected as the Crossrail project will be lowering the mainline tracks near Westbourne Park to accommodate its trains running into Paddington, impacting on the existing sewer. 

Works are scheduled to be completed by the end of the year and will be carried out remotely, as Molley is not big enough to accommodate workers.

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