Railroad HQ

The Railroad HQ is a location in the Commonwealth in Fallout 4.

Background
The Railroad moved their base of operations to the catacombs under the Old North Church after their old headquarters at The Switchboard was raided by The Institute and they were forced to flee the complex through an escape tunnel. Many of their operatives and members died or fled and the Railroad was almost disbanded. The new HQ is situated in the underground crypts of the Old North Church, but the entrance is hidden and can only be opened by following the "freedom trail", solving the puzzle and inputting the solution using the rotating wheel at the hidden door. The crypts may be dark and dank, but it offers protection from attacks and prying eyes, and allows the Railroad to keep functioning.

Layout
After the Sole Survivor joins the Railroad, he is allowed free reign in the HQ. There is big circular table in the middle of the chamber where Desdemona usually lingers. Left of the entrance is Dr. Carrington's area with medical supplies and a treatment bed. In the far left is Tinker Tom's corner with research equipment, a terminal and firing range. On the other side of the circular table is a rest area where Drummer Boy and Glory can be found (Deacon will also be here if the Sole Survivor chose not to take him as a follower). On the right side is P.A.M.'s chamber with large computers.

It is revealed there is another exit from the crypts to the side of the rest area, which also serves as an escape tunnel, and leads directly to the surface north of the church, to a ruined building with a chained up door.