3 ms·

>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

>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.

neka 7y ago
Some of it is from that but mostly from the brake pads. You can see it collect on those cylinders between carriages.