> I imagine it's also a bit difficult to separate it this cleanly, as most bigger projects will probably use a mix of technologies
Case in point – the Karlsruhe tram tunnel (listed in that dataset as simply "Tunnel Boring Machine") used a tunnel boring machine for the main east-west tunnel, but a combination of NATM and cut-and-cover for the north-south branch. The stations and the associated road tunnel project were all cut-and-cover, too.
Case in point – the Karlsruhe tram tunnel (listed in that dataset as simply "Tunnel Boring Machine") used a tunnel boring machine for the main east-west tunnel, but a combination of NATM and cut-and-cover for the north-south branch. The stations and the associated road tunnel project were all cut-and-cover, too.