Railway operations feature the extreme range of electrical power. Very heavy power flows are used for electric traction, while microprocessor equipment is used for control and communications. Railway EMI mitigation was historically based on the protection of sensitive equipment from powerful sources of electrical energy. Concomitant with this was the protection of personnel which is to some extent linked because the magnitude of voltage stresses which can disrupt or destroy equipment are able to injure. As the operation of high power systems has become more complex and the number of sensitive systems has multiplied the number of EMI effects has increased and more subtle interactions have occurred. This paper considers: the historic measures taken to mitigate EMI effects on railway equipment; the more subtle EMI problems that are becoming apparent today; and the application of GM/RT8015. (11 pages)


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