Is Mass Transit Safe?

"While many are relieved by the so-far, so-good track record of public transportation since Sept. 11, some urban dwellers say they still feel anxious about the possibility of a mass-transit attack...As part of its stepped-up transit security plan, the Metropolitan Transit Authority in Washington, D.C., has added hundreds more plainclothes and uniformed police officers, and removed trash bins from train stations, replacing them with new explosion containment cans. "