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.