The former McCoy Air Force Base, in Orlando, FL, was used by the military from the 1940s until the mid-1970s; afterward, it was redeveloped into today's Orlando International Airport. As is typical of most military bases at the time, it was served by a nearby railroad mainline (in this case, the CSX A-Line, formerly the Seaboard Coast Line) by way of a branch/spur that is now abandoned today. Its routing is hard to determine, as the area's redevelopment into Orlando International Airport has all but obliterated any evidence of it.
Chuck Hanus shares some photos of the little remaining vestiges of this small branch line, and adds: The wye joins the CSX A-Line and is just south of SR-528 Beachline Expressway and now is a circumferential route for the CSX Intermodal Facility in Taft. The line into the closed base disconnects for a few hundred feet and is not evident how the route previously ran (except looking at maps), but it picks up again in trees running between a road and a neighborhood. It continues east onto the former AFB property and later Navy property.