I've been in the Wildwood hobby shop, and like so many others it's full of RC airplanes and boats. I believe most railroaders are buying online, but there is a place in Pinellas Park that specializes in trains. That is north of St. Petersburg and west of Tampa on US Hwy 19 (34th Street). There are several ways to go, but it's close to a two hour drive depending on traffic.
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