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I noticed that the RR tracks here had been freshly ground fairly recently; I could still see the grinder marks. And I found another big grinder swarf blob in a cool shape with a residual blue color.

O3_FreshlyGroundRail.jpg (181 Kb) (under photos/25/1008-11_VanColorado/)

By Alan Silverstein, ajs@frii.com (page updated Sun Oct 26 13:50:20 MDT 2025)