Editor's Note: In some cities, transportation of the future may resemble the transportation of the past. From Washington, D.C., to Guangzhou, China, cities are looking to streetcars. NPR's Franklyn Cater looks at the struggles to revive them in Washington, while Anthony Kuhn examines the new technology that's up and running in Guangzhou.
New streetcars glide along tracks set into a grassy strip along the Pearl River in southern Guangzhou city. The first tramline covers five miles in the city's up-and-coming Haizhu district.