alt Hacker Newswait - so you think that the map is made up of people who are all sitting on that website using the Find My Train demo?
I think you are missing the point - what is collecting data on all those trains.
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Liquid_Fire • today at 10:42 AM
No, live train data in the UK is already publicly available, e.g. see https://www.opentraintimes.com/
This is matching your phone's location to the already public train data.
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The location of the train comes from trackside sensors and is available as a free API. It doesn't give actual lat/lon – it only shows when it went past a particular checkpoint. The part that needs location permission is the one that works out which train you are on. It doesn't use that to produce the main map, it's just to work out which train you are likely to be on.