There is a status update on the Arkendale - Powell's Creek 3rd track project that was posted a few weeks back on a redesigned VA DRPT website under Major Rail Initiatives: Arkendale to Powell's Creek. Probably won't be completed until 2017 from the sound of it. Project description on the website:
Arkendale to Powell’s Creek, located in Stafford and Prince William Counties, is the first Virginia part of the Southeast High Speed Rail (SEHSR) Corridor to begin construction. The purpose of the project is to accommodate higher speed passenger rail travel while minimizing interference with freight traffic. The project will consist of 11.4 miles of third track, which will be constructed adjacent to the existing CSX main line. Construction will encompass additional tracks, siding, turnouts, a new platform at Quantico Station, and replacement or modifications to Bauer Road Bridge at the Marine Corps Base Quantico. The work will also include relocation of applicable utilities, earthworks, drainage structures, retaining walls and all associated signal and communications work as needed.
DRPT is the recipient of a $74.8 million American Recovery and Reinvestment Act of 2009 (ARRA) Federal Railroad Administration grant. CSX (DRPT’s subgrantee for the project) entered into a design-build contract in mid-2014 with KC Constructors, a consortium of Kiewitt Infrastructure and Corman Construction. Rummel Klepper and Kahl (RKK) will handle all design work. All construction work is required to be finished by the middle of 2017, per the grant requirement.