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The NYC subway is using AI to detect fare dodgers
(www.theverge.com)
This is a most excellent place for technology news and articles.
Luxembourg is extremely wealthy and really small, which makes not charging for mass transit easier. But I agree that mass transit (at least regional, not bullet trains) should be free to use.
There's now a 50€ ticket in Germany which allows for use of all regional trains, but it'll get more expensive over the coming years too.