Silver Line progress report: 3

Via DCist, Amy Gardner reports that Secretary of Transportation Mary Peters has given the final seal of Executive Branch approval for a Metro extension to Dulles Airport and beyond.

Peters’s action releases the project to Congress for a 60-day comment period. After that, the project qualifies for a $900 million federal transit grant that state, local and congressional leaders have said is essential to its success.

Also linkable: the Post‘s gateway to all its Dulles rail expansion coverage, illustrated with a great photo of cluttery traffic and street furniture by Ricky Carioti.

Let’s start the countdown.