The patterns of global cooling will be extremely local. Most of the world will be unchanged. However, glaciers will begin to form in the Superstition Mts. Weaver's Needle will have ice flowing by at the 4000' level. The brother who can inhale the sea will be charged with the murder of the boy who drowned. He will be saved by, among others, the brother with the iron neck. If you doubt anything I predict, you are a denier, one of the low-lifes who don't vote the same way I do. Al Gore may give a speech in which he compares you to the people who ruled Germany before World War II. Be careful, we are watching.
Transit centers are notoriously dangerous. You never know who might show up. Of course, you might miss out on some adventures if you dwell on it too much.
BTW, California and Boston have some heated mass transit issues going on as of late. Maybe the Trans-Bering Rail Tunnel will have more luck if it tracks start from those spots. Buy me a ticket, will ya?