As reported by thegaurdain, the seven-car maglev – short for “magnetic levitation” – train, hit a top speed of 603km/h and managed nearly 11 seconds over 600km/h, Central Japan Railway said.
The new record came less than a week after the company clocked 590km/h, by breaking its own 2003 record of 581km/h.
The maglev hovers 10cm (four inches) above the tracks and is propelled by electrically charged magnets.
JR Central wants to have a train in service in 2027 plying the 286km between Tokyo and the central city of Nagoya.
The service, which would run at a top speed of 500km/h, is expected to connect the two cities in only 40 minutes, less than half the present journey time in the shinkansen bullet trains.
By 2045 maglev trains are expected to link Tokyo and Osaka in just one hour and seven minutes, slashing the journey time in half.
However, construction costs for the dedicated lines are astronomical – estimated at nearly $100bn for just the stretch to Nagoya, with more than 80% of the route expected to go through costly tunnels.
Japan wants to sell its shinkansen bullet and magnetic train systems overseas. The prime minister, Shinzo Abe, is acting as a travelling salesman in chief in his bid to revive the Japanese economy, partly through infrastructure exports.
He is due in the United States this weekend, where he will push the technology for a high-speed rail link between New York and Washington.