Division Essential requirement 1.1.2:

‘The parameters involved in the wheel-rail contact must meet the stability requirements needed in order to guarantee safe movement at the maximum authorised speed’.

In order to satisfy this requirement, the wheel profiles, the allowable profile wear and the components affecting running stability shall be specified in Section 4.2.10 in such a way as to be completely compatible with the track criteria defined in the infrastructure subsystem.

Bearing in mind the importance of maintaining these parameters to guarantee safe operation, it is necessary to make arrangements to monitor these parameters on a continuous or periodic basis to prevent their deterioration over time.