It’s the fastest speed a commercial model of shinkansen bullet train has ever achieved, although the train is expected to run at the line’s current top speed of 285 kph when it enters service.
JR Central is spending 240 billion yen ($2.2 billion) on the introduction of the train series, and will continue tests at the top speed until mid June.
Japan’s bullet trains, which debuted the same year as the 1964 Tokyo Olympics, are famed for their reliability and safety. Japan is pitching the trains for export, with JR Central aiming to sell the Supreme model to Texas and Taiwan.
Another JR company, East Japan Railway Co., is currently testing the Alfa-X, which will operate at 360 kph when it’s introduced in 2030 on lines linking Tokyo to the northern island of Hokkaido.