officially named Qatar Rail for the Guinness Book of World Records as having “the largest number of tunnel boring machines (TBMs) operating simultaneously in a single project." Qatar Rail has 21 tunnel boring machines at work on its Doha Metro project
Doha Metro TBM Guinness Record
Other railway topics related to Asia.
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John Ashworth
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Doha Metro TBM Guinness Record
Post by John Ashworth »
Qatar’s Tbm Guinness Record
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