Welcome to our site! It’s nice to see another engineer on here (and someone actually in the transit industry!!) 
Out of curiosity…
-
What made you want to cut along the western (southern?) edge of the NCRR RoW to connect to Dix Park when your design assumptions also let you play with the rail line bisecting Dix Park?
-
Does Microstation also let you play around with structural engineering details? For example, could you look at how to work with the local terrain or how much room would you have for SEHSR platforms, do or cost-benefit analyses deriving from county GIS data like how much RoW acquisitions could cost? (I’m not asking you to do that since that’s obviously work you could charge people serious money to do, but I’m just wondering if the app you’re using lets you.)
Also, FYI: we have specific threads for The Fairweather and the extension of West St. south of Union Station, so you may find that interesting, too, if you’d like some more context.