"This report addresses the Transportation Security Administration's (TSA) effectiveness in supporting mass transit and passenger rail stakeholders with preparing for and responding to emergencies. It is based on interviews with employees and officials of relevant agencies and institutions, direct observations, and a review of applicable documents."
Department of Homeland Security, Office of Inspector General, Report No. OIG-10-68
Department of Homeland Security: http://www.dhs.gov/index.shtm