One of the major problems associated with the introduction of new traction and rolling stock on to British railways is the provision of sufficient evidence to demonstrate safe operation with the existing infrastructure, particularly the signalling system. This paper discusses, in general terms, the development of models over the past few years to study the effects of traction in terfernce on vital signalling equipment. The results from these models, backed up by practical tests and experiments, have been used with some success to support safety case submissions to the Railtrack Safety Assessment Panel.
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