Two HS2 tunnel boring machines (TBM) have completed the first mile of twin bored tunnel in London.
The TBMs, named Sushila and Caroline, have installed over 847 tunnel rings each, made up of 5,929 concrete segments, since November 2022.
The tunnel being constructed by Sushila is the 'downline' and will be where trains travelling south towards London will run once HS2 is operational. Caroline is constructing the 'upline', where trains will travel to the Midlands and North.
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