Speedy passenger trains that zip between cities at 250 kilometers per hour (about 155 mph) are in wide use across much of Europe, Japan, and China. Their advantages to business travelers are many. Trains typically drop you off in urban transit centers near where you want to go. Airplanes, in contrast, are crowded and miserable--and often they're an hour or more from your final destination. Don't forget about those endless airport queues and invasive security procedures, either.
The U.S. lags badly in high-speed rail service, although Amtrak's Acela Express trains that travel between Washington D.C. and Boston can go as fast as 150 mph. (Sadly, though, they usually don't.) Wait, there's more: Persistent budgetary woes at the federal, state, and local government levels make it unlikely that we'll see a nationwide high-speed rail network anytime soon.
Image: matt-lucht, Flickr