A missive from CSX just now
"CSX today started the major construction phase of the Virginia Avenue Tunnel Project. The support of excavation work now underway consists of drilling 42-inch holes for steel and concrete pilings that will support a temporary retaining wall necessary to construct the first new permanent tunnel elements. This work is taking place at the west end of the project site in public space near 2nd and H Streets, S.E."
It goes on to say that similar work will get underway at the eastern end of the tunnel near 11th & M SE "within the next few weeks."