Replace the existing scope by the following: This document specifies the characteristics and the performance requirements of the Passenger Alarm System (PAS). The aim of the PAS is to: allow passengers, in case of emergency situations, to inform the driver; allow the driver to keep the train moving or to stop the train at a safe location; stop the train automatically: a) at a platform, b) if there is no acknowledgement by the driver. This document covers the PAS fitted to passenger carrying rolling stock and specifies: the functional requirements for an alarm triggered in the driving cab (Clause 6); the communication channel between the driver and pasasengers or on-board staff (6.4) the dynamic analysis of the PAS (Clause 7); the requirements for the degraded modes management (Clause 8); the satefy related requirements (Clause 9); requirements for the Passenger Alarm Device (PADà and PAD area (Clause 10). This document applies to mainline rolling stock, which is in the field of the EU Directive 2008/57/EC. This document does not apply to metros, trams and light rail, as defined by the CEN/CENELEC Guide 26. Existing passenger alarm systems may require modification to work in conjuction with vehicles that comply with this standard. NOTE Most of the requirements of UIC 541-6 are compliant with this standard. Other communications systems such as communication device for passengers , call for aid , emergency call or call for assistance are covered by the EN 16683 series.