Note that carto.tchoo does not provide real position in real-time: it only has access to departures, stops, delays and suppressions and interpolate position based on this.

This means that if your train is running at half-speed or stopped but does not result in an official delay, the position will not match reality.

Is the interesting part the upvotes, meaning there's more people interested in UK train networks than French ones ? And it's a comment on demographics ?

Or is the interesting part that the UK one is real-time, and the French one isn't (or at least, zooming in, I don't see them moving).

It may simply be that the language of HN is English, so more people here are, in fact, interested in UK train networks. The moving bits on this site are guesstimated based on schedules and delays and not based on real position information.

The title matters a lot. Without "real-time" this submission has likely gotten the same lack of attention.

And to see the status (Ile-de-France only): https://ratpstatus.fr/trains.html

That's no surprise. The French equivalent of anything rail related is always more complete than the UK.