Thanks for the nice comments everyone
This route is based on the modern-day Franklin Ave shuttle.
Here's some more photo-realistic goodness for you guys:
The tunnel in the foreground is the Washington Ave overpass with photorealistic side walls (sorry couldn't do anything about the top as I do not have any textures for that lol). Down the tracks to your left is a grass/dirt area being held back by the short brick wall, all photorealistic. The right side is blank space (although I might eventually put something there anyway just to make it look nicer). In the background is the Montgomery St overpass, completely photorealistic. You can't see in the photo, but I have also added some buildings onto the side behind the trees.