San FranciscofromABC7 San Francisco1 month agoVTA sticking with single tunnel BART plan after report reveals high cost of twin bore designVTA considers switching from single tunnel to twin tunnels for the Silicon Valley BART Expansion project.
London musicfromianVisits5 months agoHS2's northwest London portal designed to eliminate sonic booms from high speed trainsHS2 implements innovative tunnel extensions to prevent sonic booms from high-speed trains entering at 200mph.