This is a restored iron ore car built in 1916 for the Soo Line (= Minneapolis, St. Paul and Sault Ste. Marie Railroad). It was painted hematite red to reflect a common color of the iron ore rocks it hauled. Steel ore cars like this were used to ship high-density, Proterozoic-aged iron ore from the iron ranges of northern Michigan, Wisconsin, and Minnesota. This car is now part of the Mid-Continent Railway Museum collection in the town of North Freedom, Wisconsin.
The railroad ballast on the ground is crushed Baraboo Quartzite, which is ~1.7 billion years old (Paleoproterozoic). It comes from a nearby quarry in the Baraboo Ranges of southern Wisconsin.
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