Date: July 13,2009 In reply refer to: R-09-7 (Urgent)

摘要

The urgent recommendation in this letter is derived from the National Transportation Safety Board's (NTSB's) ongoing investigation of the recent collision between two Washington Metropolitan Area Transit Authority (WMATA) Metrorail trains on the Red Line near the Fort Totten station in Washington, D.C. The NTSB would appreciate a response from you within 30 days addressing the actions you have taken or intend to take to implement our recommendation.