<Edit 3:43pm PDT>
I ended up riding a bit down the other way on the trail, when Tara called me back (she was on the phone when I called just after the first part of the post), and then rode, and walked when I couldn't ride, back home -- which was basically straight up Fousset (which is not straight, but is up from Mission to Mesa) to Mesa, and then up Mesa to our road (albeit with a different name) and then straight down (and it is down) to the house).
I'm more tired than I should be, and I've given up many thoughts of riding my bike to either train station this summer. I need to work on getting into riding condition first -- and I'm not sure how other than riding up and down hills. (I won't object to any suggestions).