It is often difficult to determine the intervals at which trackside electronic equipment for railway signalling system needs to be replaced. In a previous study, Fujita et al. proposed a lifetime evaluation method for electronic interlocking equipment installed in an indoor environment. In this paper, the authors focus on the electronic equipment used in wayside signalling systems, which is exposed to more severe outside conditions. We evaluated the lifetimes not only of electronic components but also of substrates. The results of a case study using the developed evaluation method are also reported. Lifetimes depend on operating environment stress factors, especially temperature changes. Therefore, we recommend that replacement intervals should be adjusted according to the operating environment.

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