This branch left the ACL main line in Kissimmee, and headed east through St. Cloud to Narcoossee. It shows up on 1930s era atlases, but is not shown on 1950s atlases. It passed through what are now residential areas and was not easy to trace beyond the immediate area where it left the main line.
The included pictures show where it diverged from the ACL main, and a location about a half mile east where it passed behind residences along Neptune Rd. A short remnant is still connected to the (now CSX) main line; this is likely used for temporary storage of maintenance-of-way equipment.
Thanks to Mike Palmer for contributing information about this route.