The train's tilting mechanism to lean into curves at high speed and the high-quality airtight body minimize vibration and provide a smooth, quiet ride.

The Shinkansen's legendary smoothness is the result of three main technologies: Long Welded Rails, Slab Track systems, and Active Suspension. Unlike traditional trains that click-clack over gaps, Shinkansen rails are welded into continuous stretches of several kilometers, eliminating the jarring "joints." The tracks are also laid on a concrete "slab" bed rather than loose gravel (ballast), which prevents the rails from shifting over time. Most modern sets in 2026, like the N700S, use an Active Air Suspension that uses sensors to detect vibrations and immediately inflates or deflates air springs to counteract the movement, keeping the carriage level. Additionally, the trains use a "Tilting System" that allows them to lean into curves at high speeds without the passengers feeling the centrifugal force. This combination of "perfect" infrastructure and real-time computer adjustments allows a coin to stand upright on its edge even while the train travels at 300 km/h.