Here is what we now know:
1) Metro had pledged to run a software test for flaws each month but had no record of doing so.
2) Metro developed a three-point test that would have found the Fort Totten track circuit flaw, but staff did not use the procedure even in the days leading up to the crash.
3) Metro had about 3,000 alarms per week that showed circuits were vacant when a train was there, caused by an estimated 100 faulty circuits. But it ignored such alarms, designating them "minor" and creating a system to automatically delete them after 60 seconds.
http://www.washingtonexaminer.com/local/Metro-safety-_breakdown_-led-to-crash_-NTSB-says-1004176-99420504.html
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