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Division 7.3 Conditions under which optional functions are required

United Kingdom

Original text. Later amendments are not shown.

According to the characteristics of the track-side Control-Command Track-side Assembly and its interfaces with other sub-systems, some track-side ERTMS/ETCS and GSM-R functionality not classified as mandatory, may have necessarily to be implemented in certain applications to comply with the essential requirements.

The track-side implementation of National or Optional-functions must not prevent the entry onto that infrastructure for a train that complies only with the mandatory requirements of Onboard Class A system except as required for the following on-board optional functions:

  • An ETCS Level 3 Track-side application requires train integrity supervision onboard;

  • An ETCS Level 1 Track-side application with infill requires corresponding in-fill functionality onboard if the release speed is set to zero for safety reasons (e.g., protection of danger points).

  • When ETCS requires data transmission by radio, the data transmission services of GSM-R must fulfil the ETCS data transmission requirements.

  • An onboard assembly, which incorporates a KER STM, may require to implement the K-interface.

  • A GSM-R trackside vigilance functionality where implemented requires a vigilance onboard functionality as described in 4.3.2.11.