Since the fall of Switchboard, the Railroad's been picking up the pieces. Carrington is sending the Survivor to check the status of Augusta Safehouse.
Head to the dead drop near a random location and grab the Augusta report.
Follow the marker to Kendall Hospital. Enter the building and wipe out the raiders. Find the elevators on the upper floor (roughly over the entrance door). Move through the corridors and the nursery to the main course.
Leave the HQ and return later. Carrington will inform you that there's been a development and that they've received information that one of their agents, Blackbird, was captured by raiders. The twist? He was thought to have been killed at Augusta.
Travel to the dead drop at a random location and pick up the Blackbird Report from the dead drop marked with the railmark.