The standard curvature radius is 2,500 m for the Tokaido Shinkansen (enabling a top speed of 255 km/h, with 270 km/h enabled for the N700 series Shinkansen trains only), and 4,000 m or more for the railways that were laid for the Sanyo Shinkansen or later (enabling trains to run at a top speed of 300 km/h over these curved sections, without decreasing its speed).
曲率半径は東海道新幹線が2,500m（制限速度255km/h、新幹線N700系電車のみ制限速度270km/h）、山陽新幹線以降に建設された各線は4,000m以上（現状の最高速度300km/hでは減速せず通過できる）が基本となっている。