Running out of landfill space at home, Miami-Dade County is considering a faraway solution for disposing of its trash: paying a company to haul garbage by rail across state lines. “They’re looking to ‘train’ waste all the way up to Georgia,” Jimmy Morales, the county’s chief operations officer, told Miami-Dade commissioners on Wednesday about a potential deal with American Waste Services, a company with an office in Opa-locka. “We want to make sure, from a cost perspective, that it makes sense.” Negotiations over “trash trains” are part of a larger effort to find new destinations for the rough…