Search "Derailment" at Wash DC Metros Site:

And you get the following: (these are active links, you can click to read them)

• Tuesday Red Line service altered as a result of Monday collision (06/23/2009)
• Two Red Line Trains Collide, Fatalities Reported (06/22/2009)
• Two Red Line Trains Collide, Four Fatalities (06/22/2009)
• Two Red Lines Trains Collide, Four Fatalities (06/22/2009)
• Two Red Line Trains Collide, Six Fatalities (06/22/2009)
• Tuesday Red Line service altered as a result of Monday collision (06/22/2009)
• John Catoe named nation's top public transportation manager (05/28/2009)
• Red Line trains derail near Bethesda Metrorail station (03/27/2009)
• Red Line delays expected throughout the weekend after trains derail near Bethesda Metrorail station(03/27/2009)
• Track maintenance to affect Metro's Yellow and Green lines this weekend (02/26/2009)
• Vacuum truck equipment derails again on Orange Line (02/19/2009)
• Empty train derails at Mt. Vernon Sq/Convention Center Metrorail Station (02/19/2009)
• Poor track conditions blamed for June derailment (10/16/2008)
• Metro receives assistance to establish model transit emergency management program (07/28/2008)
• Orange Line Train Derails (06/09/2008)
• Orange Line Train Derails with Passengers on Board (06/09/2008)
• Hundreds of customers on board train that derailed (06/09/2008)
• Metro looks to defer some projects to pay for critical repairs (05/08/2008)
• Metro details nearly half a billion dollars for critical repairs (03/27/2008)
• Metro General Manager looks to improve safety, reliability and for more funding during second year on the job (01/30/2008)
• Metro Board Chairman Gladys Mack's statement on derailment (01/09/2007)

2 years of news releases brings 6 derailments/collisions. Also you'll notice there were pledges made, and funding promised to improve the safety of the system. Wonder what happened?