Today starting at 10 AM and going until 3 PM this afternoon, the Trains & Tracks Expo will be taking place at the historic Summerville Depot.  Admission is free and open to anyone interested in model trains and for train enthusiasts.  The Tennessee Valley Railroad Museum Steam Passenger Train will be rolling into the depot this afternoon around 1 PM.  The Train Expo will feature tables of trains, accessories, scale models, free play with wooden kid’s train table and collectible toys. There will be railroad memorabilia for sale, food and craft vendors, and special exhibits and demonstrations. The event will also include a 20 Year Celebration of the Summerville Turntable.   The expo will continue tomorrow from 11 AM until 3 PM.