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Some jurisdictions have the concept of "railway police" who are sworn officers protecting the railway land. See the US section for example: https://en.m.wikipedia.org/wiki/Railroad_police

They still work for the railway so there is some conflict but I don't know that they'd by any more vigilante than regular police, and they have a special status with the states compared to security guards

> Personally I'd rather not have big businesses carrying out vigilante justice to secure their property

you mean like a security guard? That is very common everywhere, at least in the US.

You only own what you can and will defend.

That's why nobody in any developed country other than the US owns anything.

Technically, no one owns property. True ownership is in allodium (by virtue of you being there and keeping others off) but there are no allodial land titles left except in certain US states (Arizona and Texas?) but the Federal government kind of supersedes them by virtue of having the most and biggest guns and controlling all of the surrounding land.