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A tunnel boring machine used to excavate the Gotthard Base Tunnel, the world's longest rail tunnelA tunnel boring machine that was used at Yucca Mountain nuclear waste repository
2020 June 3, “Network News: Vote now to choose names of HS2 Tunnel Boring Machines”, in Rail, page 11:
Images of the first two Tunnel Boring Machines (TBMs) under construction for HS2 were released on May 26. Each TBM is 170 metres long and weighs around 2,000 tonnes. Once in use, they will run non-stop for three and a half years, stopping only for Christmas and Bank Holidays.
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