THAT CHOO CHOO - View this location on map The old train station in town has been converted into a Holiday Inn ( 800-872-2529  that s 800-TRACK-29; www.lookydaddy.com), where you can stay in old-fashioned sleeper cars. The kids can play engineer on a life-size (though, sadly, nonworking) model of the original Chattanooga Choo Choo steam locomotive. Take a ride on a creaky New Orleans trolley that rolls through a 25-minute tour of the 24 acres of train yards and hotel buildings ($2). Afterward, marvel at the Model Railroad Museum s elaborate display. NYT 1400 Market Street, Chattanooga, TN Hotel, Kids

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