This European Standard defines the minimum requirements for the quality levels of track geometry, and specifies the safety related limits for each parameter as defined in EN 13848-1 and measured by any track geometry measurement system as defined in EN 13848-2, EN 13848-3 and EN 13848-4. This standard covers the following topics: ¾ð immediate action limits; ¾ð recommendations on tolerance levels for isolated defects; ¾ð relative importance of parameters with respect to the vehicle behaviours; The necessity to measure, the frequency of measurements and the selection of measured parameters are not covered by this standard. This European Standard applies to high-speed and conventional lines, including switches and crossings, of 1 435 mm and wider gauge railways provided that the vehicles operated on those lines comply with EN 14363 and other vehicle safety standards.