Historic moment as HS2 launches first giant Herrenknecht tunnelling machines
...will dig separate tunnels for north and southbound trains. Each machine operates as a self-contained underground factory - digging the tunnel, lining it with concrete wall segment...D Day for Prague Metro Line D - Construction of the fourth route of the Prague Underground has begun
...C, will be completed. In addition, the excavation of escalator tunnels will begin. In the third phase of construction, concreting of the final lining of tunnels and metro stations...
cover tunnel photo by: Matt Brown from London, England / CC BY
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