All,
I found that our threads on TriRail had become tangled together, thanks to me. The TriRail Coastal Link, which is a new proposed commuter rail route parallel to the existing one but following the Atlantic coast on the Florida East Coast RR rather than I-95, was confused with recent plans to run half of the existing line's trains into downtown Miami via a connection and utilizing All Aboard Florida's terminal. I untangled those and there are now two separate threads.
Existing TriRail to Downtown Miami