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Cants are normally arranged in circular and transition curves in the track so that the outer rail is higher than the inner rail. They aim to reduce the lateral force that occurs in the curve. Properly designed cants lead to greater comfort for passengers, higher speeds in curve and lower maintenance costs for tracks and vehicles. The cant shall be increased and reduced by means of cant ramps. Cant is included as a track element in the description of track geometry and is part of plane geometry, which also includes circular curves, straight lines and transition curves. The data product contains the size of the cant in the start and end points of the geometry element (=key points) and is expressed in millimetres. The cant is indicated positively when the outer rail is higher than the inner rail and negative when the inner rail is higher than the outer rail (so-called negative cant). For transition curves, the type of ramp is also specified. The type of ramp is straight or curved. Straight ramp is the most common type and is normally used to change the cant through a transition curve of the type globeoid. Curved ramps are used together with curved transition curves in existing tracks but are not newly added. The data product has stretch distribution and connects to the network with reference to the nearest previous node and nearest previous kilometre board with distance in meters to both the start and end positions of the circular curve (=key points) in the direction of the track link.轨道超高（cant）通常设置于线路的圆曲线与缓和曲线区段，使外轨高于内轨。该设置旨在消减曲线区段产生的横向作用力。经合理设计的轨道超高可提升乘客乘车舒适度、允许曲线区段更高的运行速度，并降低线路与车辆的维护成本。 轨道超高需通过超高坡（cant ramp）进行增减。 轨道超高作为轨道构件纳入线路几何形态描述范畴，属于平面几何的组成部分，平面几何还涵盖圆曲线、直线与缓和曲线。 本数据产品包含几何单元（即关键点）起止点处的轨道超高值，单位为毫米。当外轨高于内轨时，超高值取正；内轨高于外轨时则取负（即所谓的负超高）。对于缓和曲线区段，还需明确超高坡的类型。超高坡类型分为直坡与曲坡两种。直坡为最常用的类型，通常用于通过球面型缓和曲线调整轨道超高。曲坡仅在既有线路的曲线型缓和曲线区段使用，不用于新建线路。 本数据产品采用沿线路延展的分布式组织形式，以线路走向方向上的最近前序节点与最近前序里程标为参照，通过米级距离标注圆曲线（即关键点）的起止位置，从而接入线路网络。