The existing European railway infrastructure consists of elements designed for varying historical requirements. Most civil engineering railway infrastructure was built before the introduction of the Technical Specifications for Interoperability (TSIs) and the Eurocodes for the design of structures. This European Standard defines a line classification system for infrastructure managers and railway undertakings to manage the interface between the load limits for railway vehicles and the payload limits for freight wagons and the vertical load carrying capacity of a line. The line classification system takes into account parameters such as: - axle load (P), - geometrical aspects relating to the spacing of axles, - mass per unit length (p), - speed and provides a transparent method for determining whether the vertical loading characteristics of vehicles are compatible with the load carrying capacity of lines on the network. The line classification system utilizes a suite of line categories with each line category defined in this standard by a load model.