What do you mean? The Japanese bullet train is maglev, and frankly I was under the assumption that almost all "bullet" trains need to use maglev to get those kinds of speeds.
Bullet trains are sadly not maglev. They actually don't go _that_ fast (180-200MPH-ish is common), but look incredibly sleek compared to European high speed trains due to the aerodynamics of dealing with the large number of tunnels that Japan has.
"In 2009, the Maglev system was approved and entered commercial construction. The linear Chuo Shinkansen line is planned to link Tokyo and Nagoya by the year 2027."