Why was the tunneling machine built in Japan?

Tags: sr99

Based in Osaka, Japan, Hitachi Zosen has successfully built more than 1,300 tunneling machines, a number of them for large-diameter tunnel projects such as ours. It is critical that we ensure the manufacturer of the SR 99 tunneling machine, which is the world’s largest boring machine to date, is at the leading edge of the industry, with expertise in producing similar large-scale machines. Hitachi Zosen Corp. was selected as the SR 99 tunneling machine manufacturer ahead of three other American and international firms based on overall technical requirements, support capabilities, price and schedule.