New York subway ridership count unlinked trips. Passengers doing transfers between subway lines are counted twice. It's the same for many other US network.
For comparison Paris métro or London underground ridership just count passengers entering in the network. Passengers transferring lines are not counted twice.
The real ridership of New York subway in 2024 was 1,195 million in 2024 when using using the same calculus method.
https://www.mta.info/agency/new-york-city-transit/subway-bus-ridership-2024
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