Long trains cause problems for communities near crossings

Freight trains are getting longer in the U.S. with some stretching for two or three miles. Longer trains allow for more goods to move more efficiently, lowering fuel costs for the railroads. But these trains, especially when they stall, are cutting some communities in half. That's the focus of a new report from Investigate TV and ProPublica. William Brangham discussed the impact with Joce Sterman.