One of the senior engineers said that the trains in that area are badly in need of feature upgrades, and servicing / reinforcement but there has been no movement towards that. For instance they are supposed to have a camera installed that shows what is happening with the train and will pick up crashes like this as they happen.
Computer system under scrutiny in D.C. Train crash
WASHINGTON - Investigators looking into the deadly crash of two Metro transit trains focused yesterday on why a computerized system failed to halt an oncoming train, even though there is evidence that the operator tried to slow it. Ref. Source 6
Get this, days before this crash a device meant to PREVENT train crashes was installed into the system of one of these trains and it malfunctioned thus causing the crash! Either jobs are going to be lost or manufacturers are going to be sued, BUT there should be detection in place to know when these things are manufactured.