Hey Dave,
Like Ben #2 really jumps out at me. You have some awesome lines in it and it's a winner for sure. The others are interesting, and train tracks are a compelling subject, one I want to shoot more.
As for the noise in the sky, I made comments in your other post about that. Shooting that high of an ISO really requires Noise Reduction in Post I think, my favorite is Noiseware.
There is a lot going on for Christmas, but it would be nice to get together again to shoot some street shots.