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I don't think London Underground release that level of information. Thameslink does[1], Overground should too.

https://www.opentraintimes.com/maps/signalling/tlk_core

I expect TfL's "Tube departure boards, line status and station status"[0] feed would suffice. It's updated every 30 seconds. Plenty more data available too.

[0]: https://tfl.gov.uk/info-for/open-data-users/

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