MONSTER-sized tunnel boring machines as long as a soccer pitch used to build the Melbourne Metro Rail Tunnel could be abandoned deep under the city. The Melbourne Metro Rail Authority says it will ...

Employees of CCCC Tianhe Mechanical Equipment Manufacturing Co assemble the parts of a tunnel boring machine at a workshop in Changshu, Jiangsu province, in September. [Photo provided to ...

All of the tunnel boring machines were built by China Railway Engineering Equipment ... The tunnel features a crown overburden of about 26 meters and a minimum horizontal turning radius of 300 meters.