Metro says there are now 3.7 miles of uninterrupted cell service on an underground portion of the Orange, Blue and Silver Lines.
The utility work will close lanes during midday, weekends and some overnight hours.
Federal investigators said the helicopter that crashed Saturday in Charlottesville had crashed in 2010 when its engine failed.
The track issue occurred outside Dupont Circle shortly before 10 a.m.
The crash caused main lanes to back up for about 5.5 miles, according to traffic officials.
Trains have been ordered to slow to 35 mph from 45, but Metro said the impact on commutes would be "minimal."
It lets you check for available bikes and unlock a bike at the docking station without using a key. Bikeshare members can keep track of their travel statistics, and casual users can purchase ride passes.
The transit agency said to expect delays in the direction of Glenmont.
The crash killed two Virginia State Police officers who were conducting surveillance work during the white nationalists rally in Charlottesville on Saturday.
It looks like 2017 is shaping up to be one of the busiest summer travel seasons ever, according to TSA numbers.