The behind-the-scenes tales of hit products and creations from Japan: this is Japan's Top Inventions. This time: the Shinkansen, sometimes called the bullet train, which set a new record for high-speed rail, 256km/h, in its trial runs. The inspiration for unlocking that incredible speed came from aerodynamic airplanes. Shinkansen technology is now being adopted around the world in places like the UK and Taiwan. This time, we discover the drama behind the creation of this high-speed invention.