A good tunnel safety paper.
https://www.sciencedirect.com/science/article/abs/pii/S088677982100002X
Sanetoshi Saito Yuki Yamauchi
Railway Technical Research Institute, 2-8-38 Hikari-cho, Kokubunji-shi, Tokyo 185-8540, Japan
https://www.sciencedirect.com/science/article/abs/pii/S088677982100002X
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.sciencedirect.com/science/article/abs/pii/S088677982100002X
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