I thought Herrenknecht produce TBMs in Germany. But Australian press say
"Once they are in the ground, the German boring machines - manufactured in China by Herrenknecht - will operate 24/7 and tunnel about 10 metres per day. "
What do you know?
cover tunnel photo by: Matt Brown from London, England / CC BY
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I do not know specifically about Herrenknecht but it is standard industry practice to manufacture some parts in China in tunnel industry. I believe Australian company Terratec does almost all its manufacturing in China for example. The reason is cost reduction.