Improving tunnel ventilation stems from a National Transportation Safety Board order in response to a smoke emergency at L’Enfant Plaza six years ago
https://www.washingtonpost.com/transportation/2021/06/11/metro-red-line-delays/
cover tunnel photo by: Matt Brown from London, England / CC BY
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https://www.washingtonpost.com/transportation/2021/06/11/metro-red-line-delays/