High speed trains get washed regularly using fully automated systems — no manual labor required. High pressure jets blast the surface clean while large contour-following brushes scrub every gap from nose to tail. This isn't just cosmetic — accumulated dust, insects, and oil residue increase surface wear and affect operating condition over time. Most passengers never see this because washing happens during off-peak hours in dedicated facilities far from platforms. Aircraft face the same strict surface cleanliness requirements for the same reason — at high speeds even minor surface contamination affects performance. These aren't just washes. They're speed maintenance.
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