scope:

The intervals detailed in this standard relate to the maintenance tasks defined in the Signalling Maintenance Work Instruction suite of documents. Details of these are contained in RT/E/S/10660. The existing maximum and normal intervals are included below.

The intervals shown are intended to maintain the designed safety and reliability by detecting and correcting deficiencies to signalling infrastructure before there is deterioration or failure. The intervals have been derived from best practice over a wide range of operating use and environment but their inclusion in this standard does not endorse them as appropriate for every item of equipment in every operational circumstance. Where specific operating use and environment can be identified a case may be made to propose a change to the intervals shown.

PURPOSE

This specification defines the existing maximum and normal intervals currently applicable to signalling maintenance tasks.