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 legendary "smoothness" of the Japanese Shinkansen (Bullet Train) is the result of a "total system" approach to engineering that eliminates vibration at the source. First, the trains run on dedicated, high-standard tracks that are completely separated from slower freight or local trains, featuring a "standard gauge" (1,435 mm) that is wider and more stable than Japan's older lines. The rails are continuously welded, meaning there are no "clickety-clack" gaps between segments, and the curves are designed with a massive radius to minimize lateral G-forces. Mechanically, the train cars utilize active suspension systems and air springs that use compressed air to instantly counteract any tilt or tremor. Even the air pressure is managed; Shinkansen are air-sealed like airplanes to prevent the "ear-pop" and jolt that occurs when entering tunnels at 320 km/h. This combination of track precision and onboard dampening technology ensures that a coin stood on its edge in a Shinkansen window will often remain standing for the entire journey.