Due to inevitable geographical reasons as well as the availability of necessary land, sections with a smaller curvature radius exist around Atami and Tokuyama, although not many trains stop at these stations.
また、通過列車が多い熱海駅や徳山駅の前後などにおいても、用地や地形の関係からやむを得ず急曲線が存在する区間がある。