IEC 60850:2014规定了牵引系统供电电压的主要特性，例如牵引固定装置，包括由接触线供电的辅助装置和机车车辆，用于以下应用: -铁路； -引导大众运输系统，如有轨电车、轻轨、高架和地下铁路以及无轨电车系统； -铁路材料运输系统，例如用于煤或铁矿石。本标准也适用于低速磁悬浮列车或直线电机运输系统。与上一版相比，此新版本包括以下重大技术变更: -澄清第3条中的一些定义； -完成第4.1款； -修改的表1； -用新的表B.1修改附件B。

IEC 60850:2014 specifies the main characteristics of the supply voltages of traction systems, such as traction fixed installations, including auxiliary devices fed by the contact line, and rolling stock, for use in the following applications:
- railways;
- guided mass transport systems such as tramways, light trains, elevated and underground railways and trolleybus systems;
- rail bound material transportation systems, e.g. for coal or iron-ore. This standard is also applicable for low speed maglev trains or linear motor transport systems. This new edition includes the following significant technical changes with respect to the previous edition:
- some definitions in Clause 3 clarified;
- Subclause 4.1 completed;
- Table 1 modified;
- Annex B modified with new Table B.1.