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为了使机车车辆能顺利地通过曲线,在半径小于某一值的曲线地段必须作适当的轨距加宽。在我国沿海干线的技术改造过程中,曲线轨距加宽标准是必须研究和制订的轨道设计参数之一。 世界各国铁路的曲线轨距加宽标准大都是按机车车辆在曲线上的几何内接条件制订的。但自60年代出现高速线路以来,许多国家都根据在曲线上行车的安全性和平稳性,从轮轨相互作用荷载的观点,修订了自己的标准。
In order for locomotives to pass the curve smoothly, it is necessary to broaden the gauge at a radius less than a certain value. In the process of technological transformation of the coastal lines in China, the standard of curve gauge widening is one of the orbital design parameters that must be studied and formulated. The curve gauge widening standard of the railroads of all countries in the world mostly is made according to the geometrical internal connection conditions of the rolling stock on the curve. However, since the emergence of high-speed lines in the 1960s, many countries have revised their standards from the point of view of wheel-rail interaction loads based on the safety and stability of driving on the curve.