Four travel news stories today: France unveils the world's fastest train. Germany debates putting speed limits on its autobahns to protect the environment. The Swiss are building the worlds longest tunnel under the Alps. And China shows off the world's longest bus.

• Train à Grande Vitesse: France Christens High-Speed Rail Link
• Talk of speed limits on autobahn revs up Germans
• Swiss dig world's longest tunnel
• 'World's largest' bus debuts in Shanghai
• Blubrry.com
• Geography for Travelers