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The last point is a problem (on both sides) but it seems to have a simple fix - a small area where you can buy tickets, and a larger area where you need a ticket to access. You can trespass homeless out of the smaller public area if you need to (you very likely don't) and if you have a ticket you belong in the ticketed area whether you're homeless or not.

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I needed to get from Portland to Eugene. In Oregon, there's a bus service that's paid with some state funding that goes from train station parking lot to train station parking lot. I wanted to use the restroom at Union Station in Portland and the security guard required me to show him that I had a valid ticket to stay in the building.

So it was kind of like what you are suggesting.

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