This document is applicable by the authorities involved in all types of railway operation. This European Standard is applicable to new designs, to modifications and to the checking of the gauge for vehicles already in use. The application of the rules of this European Standard makes it possible to determine the maximum dimensions of vehicles related to the structures. The rules given in this standard are not applicable to vehicles guided by a single rail. This European Standard contains: - the associated rules for all the gauges for rolling stock; - the requirements for composing the technical gauge report to submit to the Acceptance Authority in order to confirm vehicle conformity to this standard; - the requirements for maintaining the vehicle characteristics influencing gauging throughout its operational life.