DIN EN 50728:2025-09

This document defines the measurement and evaluation methods of rolling stock interference current emissions to demonstrate compatibility with track circuits. This includes rolling stock with or without traction equipment. The established limits for compatibility are defined in ERA/ERTMS/033281, PD CLC/TS 50238-2 or NNTRs as current flowing between the vehicle and the electric traction power supply system that can disturb the track circuit receiver, as part of the track circuit system. Additionally, the referred documents can define a minimum rolling stock impedance in order to guarantee compatibility between the electric traction power supply system and track circuits. This document is relevant to the interference current limits defined in the “frequency management” for track circuits as defined in ERA/ERTMS/033281. It is also applicable to the demonstration of compatibility with all other types of track circuits which have established compatibility according to EN 50617-1. Finally, the methodology defined in this document can also be applied to other track circuit types, including those for which the only requirements are defined in NNTRs. Apart from interference currents and impedance, all other interface parameters between rolling stock and track circuits are outside the scope of this document. Additional measures may be required in order to mitigate safety risks for track circuits that are susceptible to safety-critical interference. The required precautions and safety considerations fall outside the scope of this document, but these can be found in the NNTRs. Specification of test, measurement, and evaluation procedures for the emission of interference currents by railway vehicles.