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kevin_from_illinois t1_j124n3o wrote

That may be for historical trends, it could also be from station entrances and exits. Interestingly metrobuses actually have a live indicator of bus capacity, it is explained here: https://www.wmata.com/about/news/Real-Time-Crowding.cfm

I've updated my previous comment accordingly.

Note that the article explicitly states that the tech is not installed on train cars, at least during December 2020.

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