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Someone on the Colorado Rockhounds Facebook page suggested these unusual chunks of slag that I found along local railroad tracks might be steam engine firebox bricks from years ago.
0402A_RailroadSlagTops.jpg (618 Kb) (under photos/20/Random/)
By Alan Silverstein, ajs@frii.com (page updated Tue Mar 10 18:16:39 MDT 2026)