On this day, 36 years ago, on October 20, 1989 (September 21, 1989, the lunar calendar), Japan claimed to have developed the "world's fastest train." On October 20, 1989, Japan announced that it had built the "world's fastest train" with a speed of 517 kilometers per hour. This ultra-high-speed magnetic levitation train improves on the old suspension train designed last year and increases the speed of about 80 kilometers per hour. The front of this kind of train can carry 3-5 carriages, reducing the original 3 hours required from Tokyo to Osaka to about 1 hour. Experts also conducted extensive research during the test, such as: Are superconductive magnets durable? What is the impact of strong magnetic force on passenger health (passengers must take off their mechanical watches while in the car)? What is the wind pressure when passing through the tunnel? In addition, could this ultra-high-speed train also lead to excessive concentration of the population in central cities, causing a series of unexpected traffic problems?