New York Subway Cars Go High Tech

"The first cars took to the tunnels this week. Five years in development and costing $1.5 million a car, more than 200 will be in service by the end of the year. Technology is everywhere on the new train. Touch-sensitive doors bounce back when blocked, color screens showcase the next station, and an understandable virtual voice announces train destinations. But most of the big changes are buried beneath the unusually clean floors. New AC motors on each axle will use up to 25 percent less energy as dynamic brakes translate stopping force into power that can be pumped back into the third rail for use by other trains."