Very nicely done stations. Makes me think doing some of the commuter stations around Seattle might not be as big a PITA as I thought they might have been.....
One suggestion though. I've found the "Parking Lot Textures" very cumbersome to work with. Its very hard to get them to use what I'll call an "Appropriate area of space". Ultimately this only *really* matters if you're on a DEM map or something with HOGZ or some other Prototype area delineations, so if you're not, by all means knock yourself out. That said, I've found the Parking lot Splines much easier to work with for getting parking lots to fit where I need them. I see you've already done that at one of your stations. There are however Parking lot Splines that are Just Lines, so you just texture an area the asphalt/Concrete color of your choice then drop the lines over them, and as they're splines you can make them any shape/angle you want with no fuss.
Anyway, Keep up the good work!
Falcus