Looking at this, if the green outlined areas are the parking garages, there has to be some sort of switching mechanism between the convergence of all three lines and out to the two garages.
One possible pathway into and out of the garages would include two tracks / rails out of the AOA/POP line and the Riviera line into the DHS station. A second set of switches on the line out from the DHS station into the two garage buildings.
My quick and dirty layout for these paths.. (forgive my poor artistic skills). this is assuming entry to the garages / barns at the end and not the side. It also explains the low height on the red towers between the buildings.
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