本文件定义了城市轨道车辆的以下要素: -乘客和驾驶员之间通信设备的功能要求或 运营控制中心（OCC）；-通信设备的动态行为。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document defines the following elements for urban rail rolling stock: — the functional requirements for a communication device between passengers and driver or operations control centre (OCC);— the dynamic behaviour of the communication device.All current amendments available at time of purchase are included with the purchase of this document.