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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 Sun Mar 9 14:33:54 MDT 2025)