Hello All,
First time here. Thought I would give some feedback though to this question.
Would you be opposed to doing a elvated track and having two systems running in that fashion?
From the picture of the layout, I would allow my imagination to have the top track as a personnel train such as High Speed and have the lower rail to be for the Cargo. Have some means of inter connection for the minifigs to get to one or another....
Just my pondering.