Can mass transit be protected?
The massive number of subways and trains makes it tough
By Gary Stoller
WASHINGTON, DC — The government's top security officials say they are upgrading subway and rail defenses against terrorist attacks throughout the country, but a USA TODAY examination finds gaping holes, including many that may not be possible to plug.
The holes in security leave travelers more vulnerable on the more than 4 billion trips they take by subway and rail each year than in the sky, where airlines carried fewer than 700 million passengers from U.S. airports last year.
Full story: Can mass transit be protected?