seven-car train beat previous record of 361mph -lrb- 580km/h -rrb- set in 2003 .
it made use of a magnetic charge to lift and move it above a guideway .
maglev service between tokyo and nagoya will begin running in 2027 .
train 's engineers are planning new attempt to reach 373mph -lrb- 600km/h -rrb- .