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No, it does not do, what I described. I was talking about solely determining it inside the train. At least Wikipedia indicates it is similar to LZB or ETCS. I am not familiar with PTC itself.

That's a research topic, because the infrastructure companies would like to not pay as much for maintenance and still have a high sequence of trains. Also with track based train control systems you can only have very high resolution in specific places, where you place your track-side infrastructure, but it would be nice to have that resolution anywhere you like.

by lxgr12 hours ago|

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PTC is a performance standard, not a concrete system. Some PTC systems do seem to use GPS for train positioning, which does seem surprising from a European train protection system perspective which all seem to completely avoid reliance on GNSS so far.

I guess a much less dense and largely overground network, mainly used by fairly slow moving freight trains as opposed to highspeed passenger connections, changes requirements somewhat.

by 171862744011 hours ago|

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Thanks.

I mean they are systems that rely on GNSS in Europe, but no safety systems, that would be simply to unreliable. For example I believe the railway announcements in Germany to depend on GNSS. They are also unreliable.