The problem is/was, how would Metro pay for the circuit replacements ? The answer in today's Washington Post at :
So a Metro panel is recommending that the full Metro board approve not only $10 million for track circuit replacement but also another $15.7 million for bringing about other safety measures suggested by the N.T.S.B. in the aftermath of the Fort Totten crash. http://www.maryland-law.com/blog/metro-crash-safety-repairs-price-tag-one-billion.cfm
Good for Metro!