China plans the world's longest rail tunnel to connect mainland and Taiwan with high-speed trains * 84-mile Taiwan Strait Tunnel would link Pingtan, Fuzhou and -- rail tunnel. The billion-pound project aims to take high-speed trains through the Taiwan Strait at up to 250km/h (155mph) by 2030, according to South China Morning Post. -- part of its territory - mean construction is unlikely to start any time soon, the report said. A Fuxing bullet train runs on the Beijing-Shanghai High-Speed Railway. China has been planning to build an undersea railway tunnel that would link the mainland and Taiwan A Fuxing bullet train runs on the Beijing-Shanghai High-Speed Railway. China has been planning to build an undersea railway tunnel that would link the mainland and Taiwan A Fuxing bullet train runs on the Beijing-Shanghai High-Speed Railway. China has been planning to build an undersea railway tunnel that would link the mainland and Taiwan -- The ambitious project achieved new prominence in 2016, when Beijing included a cross-strait high-speed rail network in its then-new five-year plan.