— defines the various profiles needed to install, verify and maintain the various structures near the structure gauge;

— 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.