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Not frictionless, so it will also slowly degrade over time. It just has so much mass built-in that it’s not obvious.

But, critically to the conversation we're having, does not produce harmful particulates when it does so.

Railway dust contains quite a bit of PM2.5, PM10 and NOx.

Yup, make a rail to everybodys home instead, that will solve it.

It's worked before