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Solar panels between railway tracks?
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Hopper cars lose coal and ore all the time
This is Switzerland, outside of a small number of corridors the majority of tracks see virtually nothing but passenger trains.
But these solar panels will be present on those with hoppers.
i'd be more worried about about smudgy stuff. they get dusty, then it rains and the panel is covered in a film of dirt. bird shit on solar panels is already plaguing home users