How to unlock: The quest becomes available after you start the Underground Undercover quest and talk to Desdemona in Railroad HQ (M6,2)
- Go to Ticonderoga Safehouse
- Kill all Coursers
- Report back to Desdemona
Go to Ticonderoga
Once you get to the Railroad HQ during the Underground Undercover quest or after completing it, you will be informed about the availability of this quest. When that happens, go talk to Desdemona.
You will learn that a Railroad's building, Ticonderoga, where during the Boston After Dark quest you took one of the companions, was attacked by synths. Reach the building and drive to the top using the elevator. There you will find a Courser and more than a dozen of regular synths on this, higher and lower floors until the ground level. You don't have to talk with the Courser, instead perform a surprise attack. The opponent has much more health than other enemies and he is able to become invisible.
Walk to the ground floor after you get rid of the first Courser - the elevator will be locked. Before the entrance to the building you will have to face the second Courser with parameters similar to the first one. Get rid of him and go back to Railroad H.Q. where you must report to Desdemona.
Quest rewards: Experience points, random armor part, 500 bottlecaps.