This document specifies the performance test methods for fuel cell power systems intended for use in electrically propelled rolling stock. The scope of this document is limited to electrically powered rolling stock. Hydrogen rolling stock with an internal combustion engines are not included in the scope. This document applies to hydrogen fuel cell power systems for electrically propelled rolling stock. This document does not apply to reformer-equipped fuel cell power systems. This document does not cover the hydrogen fuel systems that are permanently or separately attached to either the rolling stock or the fuel cell power system. These are covered by IEC 63341-2. The basic system overview with the links between the main functions and the links to the external system is shown in Figure 4 of IEC64431-1. All relevant standards are described in IEC 63341-1. Performance targets for fuel cell power systems are agreed between the user and the manufacturer.