From what the developers said at the State of the Map 2026, they will implement public transport routing using Transitous, the same system that cartes.app uses. Not sure if this means that the overlay will include all the lines though
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Especially if it spends a long distance underground - Seattle's light rail is underground in a tunnel for all of downtown and several other places.
It's the same way in New York City. No regional trains shown with the subway overlay.
I can't answer if it's on the roadmap or not, just figured I mention it because it seems to be this way by design.
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