Abstract
The 25 kV AC traction system, distributed along the length of a railway, generates strong electromagnetic fields longitudinal to the railway line. It is a major source of interference to modern electronics based railway signal and control equipment. The design of a signal system thus needs to take into consideration the various sources of interference and must be immune from these undesirable disturbances. This paper summarises the various interference phenomenon and the interaction between systems, and highlights the practical approach to mitigate these undesirable effects on the systems operations.
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