scope:

This Guidance Note applies to all those undertaking engineering activities of any sort on the railway in the vicinity of TASS installations. It is limited to work directly affecting TASS balises which does not affect their configuration. Any work likely to alter the configuration of the infrastructure, e.g. speed change, new signalling, clearances, new rolling stock, must involve appropriate re-assessment of the TASS system design.

Purpose

The Tilt Authorisation and Speed Supervision (TASS) system is now being installed on Network Rail infrastructure.

As with any signalling equipment its operation may be disrupted by inappropriate actions by those engaged in other activities on the railway including design, installation, maintenance and renewal of track, power supplies and civil structures.

This Guidance Note gives advice to those engaged in various engineering activities on the treatment of the TASS system and the precautions they should take in respect of it. Detailed requirements are given in the three documents referenced in section 3.