scope:

This document covers heavy rail rolling stock.

This document does not cover urban rail rolling stock.

NOTE 1 EN 17355 covers communication device requirements for urban rail rolling stock.

This document specifies:

- the functional requirements for a Call For Aid and Communication device;

- the dynamic analysis of the Call For Aid system.

NOTE 2 In a formation of vehicles where one complies with this document with one that does not, it is possible that the call for aid is not fully functional.

NOTE 3 The Call For Aid function is separate from the Passenger Alarm System (PAS), which is provided to deal with emergency situations. The PAS is described in EN 16334-1.

NOTE 4 The communication device can be different from the PAS, but it can share some or all parts of the PAS to achieve its functionalities.

NOTE 5 The PAS is regarded as a safety relevant system whereas the CFA and communication device are non-safety relevant aids to passengers.