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Just pay for it? Look, the camera here works just fine:

https://www.youtube.com/watch?v=FsuyLs_0C0I

If you can prevent just one of those (and if we ignore injury, trauma and death) it should cover expenses for quite some time.

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There is also the issue of recognition software that doesn't have too many false positives, and properly tuning it for each crossing, in all light situations. The amount of time and work needed can really be very large. I'm not against it though. Some pilot projects would be a good idea.

Camera security use to be a guy looking at 20 TV's. Then came motion detection. Today we can do much more of course. You would have a set of certainly not good situations, a set of certainly good and a set of things a human should look at.

It's of course fine to automatically shut down a few trains per year if it doesn't create a dangerous situation in it self.

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