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Rail transit systems around the world benefit from increasingly sophisticated systems for electric propulsion, auxiliary power, control, and signaling. Applying these systems cost-effectively requires interoperability standards and testing procedures that guarantee EMC. This paper surveys the sources of EMI in rail transit from propulsion and auxiliary power systems, and the potential disruption of track signaling and train control systems that can result. U.S. and European standards for design and testing of rail transit system equipment are reviewed. Standards and test procedures for radiated interference in rail transit systems are reviewed, and EMI/EMC challenges are noted.