You are giving it to them. That's why the demo asks for your location permission, and that's why the API expects location info.

"You" here means another app that integrates their API (or you as an individual using the demo on their website). How the other app gets it is up to the other app - ideally it also just queries it directly and requires location permission.

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frnz 2 hours ago | parent [-]

so an empty train does not show up?

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Liquid_Fire an hour ago | parent | next [-]

Not sure how you came to that conclusion. An empty train would still exist in the live train data. It does not depend on mobile phones, but on rail signals and other such tracking built into the rail infrastructure.

	▲	frnz 44 minutes ago \| parent [-]
		of course, sry, I didn't read the descriptions. Thanks for clarification!

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Hikikomori an hour ago | parent | prev [-]

Does a train exist if you are not on it?

	▲	dofm 10 minutes ago \| parent [-]
		Yes; this is not a German train tracker. (How awesome it is to be able to make this joke as a Brit ;-)