Herrenknecht's latest technology allows tunnels to be widened while trains continue to pass through
A train passing through Herrenknecht’s Tunnel Enlargement System on the Lahn Valley Railway, shortly before the start of excavation work on the Cramberg Tunnel. Credit: Herrenknecht
In the second half of the 19th and early 20th centuries, hundreds of railway tunnels were built in Europe. They are largely still in operation today. In the coming decades, a considerable number of tunnels...
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