Dozens of miles of abandoned railroad beds leftover from the logging boom in the Great Smoky Mountains were converted into trails by the Civilian Conservation Corps in the 1930s. Many ruins and artifacts from the logging and CCC days can still be found along these trails. “Ramble On” discusses how the trail system in the Smokies (and other national parks) was developed: https://www.amazon.com/dp/B0BTRVVRYT
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