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Part 2 emphasizes that safety is not a component issue but a system issue. A train might have perfectly functioning brakes (component reliability), but if the signaling system fails to tell the train to stop (system safety), a collision occurs. Part 2 guides engineers on how to model these interactions. bs en 50126-2 pdf free download
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While it is not always possible to access a free PDF download of BS EN 50126-2, there are several options available: there are several options available: