>The ground breaking part is not the tunnel but the vehicles.
Underground LRT (aka "a subway") are electric vehicles that travel in tunnels. In what sense is replacing a subway with an electric car that runs on rails "ground-breaking"?
The initial idea was to have tunnels for cars, however since most cars on roads are ICEs, the cars on rails was brought about as an alternative. In an ideal world with 100% electric vehicles, the complete transportation can be moved underground and the cities can appear as natural as possible.
Underground LRT (aka "a subway") are electric vehicles that travel in tunnels. In what sense is replacing a subway with an electric car that runs on rails "ground-breaking"?