During my trip I wrote three blog posts (including uploading photos), checked email and browsed the Web. When the service dropped to 3G, it got more difficult to access some sites or perform uploads. The data speeds also seemed to slow the faster the train went -- we got our best coverage and speeds when the train was moving slowly or at a station.

Blow-by-blow description of trip:

12:01 p.m. First test via speedtest.net -- 2.2Mbps download, 0.26Mbps upload. Those are 3G-like speeds. The site also seems to think I'm connecting from Kansas (possible IP address assignment glitch?).

12:10 p.m. First drop from 4G to 3G speeds. Returns to 4G coverage/connection at 12:20 p.m.

12:22 p.m. Spoke too soon -- down again to 3G. This would happen on and off for the next 12 minutes or so.