The future of the train system, maglev, will connect Osaka to Tokyo with an hour commute. Check out the technology. Keep up to date with the Japanese progress here and here.
If you're passing along the Sanyo local line from Hakata to Osaka and want to stop at a good restaurant, check out Watamin-chi. Thirty seconds walk from Saijo Station. Excellent variety, and high quality food. They just opened.