This standard:¾ defines the various profiles needed to install, verify and maintain the various structures near the structuregauge;- lists the various phenomena to be taken into account to determine the structure gauge;- defines a methodology that may be used to calculate the various profiles from these phenomena;- lists the rules to determine the distance between the track centres;- lists the rules to be complied with when building the platforms;- lists the rules to determine the pantograph gauge;- lists the formulae needed to calculate the structure gauges in the catalogue.