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Re:Stable 1.2 Gigabit/s Internet achieved in moving train in... by Symbiote on Wednesday October 21, 2020 @05:16PM (#24852285)
I think the brushes would wear out pretty quickly.

They use high pressure (1500 Bar!) water jets instead, and apply sand to the rails: https://www.networkrail.co.uk/stories/leaf-busting-trains-pr...

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