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Basically, anyone who says there are no heritage railroads in the US hasn't looked very far. They're all over the place. Most have just 6 or 7 miles of mainline, but they run regular excursions. For example, the Tennessee Valley Railroad Museum in Chattanooga. They have three working steam locomotives, about a dozen diesels, twice that many passenger cars and about six miles of line they run excursions three times a day as well as an all day excursion on the line from Chattanooga to Kennesaw, Georgia the run once or twice a month.