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Re:Decades of diesel use in Europe have created a public hea... by dunmalg on Wednesday October 09, 2019 @07:57AM (#21202299)
>Presumably this mostly comes from the steel wheels on steel track

Highly unlikely. Steel-on-steel is used because it lasts for YEARS without needing replacing due to wear.

Re:Decades of diesel use in Europe have created a public hea... by neka on Wednesday October 09, 2019 @10:50AM (#21203777)
Some of it is from that but mostly from the brake pads. You can see it collect on those cylinders between carriages.