This is a working Baldwin RS-4-TC locomotive at the Mid-Continent Railway Museum in the town of North Freedom, Wisconsin. It was built in 1954 and rebuilt in 1986.
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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