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“While this TBM is operating on the downline, another TBM is already working for the construction of the parallel upline,” said DMRC spokesperson, Anuj Dayal.
Two more TBMs are operational on the Airport Express Link between New Delhi Railway Station and the Shivaji Stadium.
The Airport Express Link has an underground corridor of 15.7 km. “For Phase II, which has a 30-km underground section, about 16 km is being built with TBMs,” Dayal added. All tunneling work is expected to be completed by December this year.


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