The Shinkansen (新幹線, Shinkansen) is a network of high-speed railway lines in Japan operated by four Japan Railways Group companies. Since the initial Tōkaidō Shinkansen opened in 1964 running at 210 km/h (130 mph), the network (2,459 km or 1,528 miles) has expanded to link most major cities on the islands of Honshū and Kyūshū with running speeds of up to 300 km/h (188 mph), in an earthquake and typhoon prone environment. Test run speeds have been 443 km/h (275 mph) for conventional rail in 1996, and up to a world record of 581 km/h (361 mph) for maglev trainsets, in 2003.