This European Standard specifies requirements for the acceptance of simulation tools used for the assessment of design of traction power supply systems. The simulation results allow the calculation of quality indexes requested by EN 50388:2012@ Clause 8. This European Standard is applicable to the simulation of AC and DC traction power supply systems@ including lines defined in the TSIs. This European Standard does not deal with validation of simulation tools by measurement. The minimum required functionalities are described in this European Standard (Clauses 5@ 6@ 7 and 8). The previous statement is valid regardless of how many additional functions the simulation tool has@ e.g. energy efficiency@ advanced regenerative braking@ calculation of load angles ?? NOTE A new test case will be drafted considering metro@ tramways and trolleybuses using 600 V ?C 750 V DC. Until this test case is available@ this standard can also be applied to subway@ tram and trolley bus systems. This test case will also integrate rail systems using 750 V. Additionally@ the application of the standard ensures that the output data of different simulation tools are consistent when they are using the same set of input data. This European Standard only applies to the simulation of traction power supply systems characteristics at their nominal frequency for AC or DC systems. It does not apply to harmonic@ electrical safety or electromagnetic compatibility studies over a wide frequency spectrum. This European Standard does not mandate the use of a particular simulation tool in order to validate the design of a traction power supply system. This standard has not the purpose to avoid the need for the experience of a skilled power supply designer@ as well as the fulfilment of other standards like EN 50388.