How to unlock: After completing the Butcher's Bill 2 quest and returning to Old North Church (M6,2), Carrington and Desdemona will be discussing with PAM.
- Talk to Doctor Amari
- Eliminate the Gen 1s
- Report back to Desdemona
Speak to Doctor Amari in the Memory Den
After the preliminary conversation with Carrington and Desdemona, you will go to the location called Goodneighbor. There you will find a place called Memory Den.
Irma, who is overseeing this place, will welcome you. You don't need to talk with her - however, if you will pay 100 bottlecaps or use persuasion (low Charisma level), you will be able to start a new side quest, not related with Railroad quests - The Memory Den. Walkthrough to the quest can be found in the chapter focusing on the location.
Eliminate Gen 1s
The rest of the quest is simple and not complicated. You will go to the Malden Station where you can face few supermutants from the nearby hospital. Your main enemies are the synths that can be found in the underground metro station. Luckily, Gloria with a minigun is waiting for you there. You can agree on her proposition to join you for the quest and help you in battle.
Synths very easily lose her limbs, just like ghouls, so it is a good idea to shoot their legs or hands, making it impossible for them to use weapons. Grenades and laser weapons are very effective as well. Usually they have institute pistols, few pieces of ammunition and, optionally, some bottlecaps.
Walk through the metro in the underground. You will find an elevator that will lead you further. On the lower deck you will face two slightly stronger synths that will get in your way. It's the ending of this part of the quest. Walk through another metro station into another elevator where you will find the exit. If the quest marking doesn't lead you to exit, it should mark the remaining synth that could have hidden someplace in the metro. Return to the headquarters in order to finish the quest.
Quest rewards: experience, 200 bottlecaps, 2 Stimpaks, 2 Stealth Boys, Randolph Safehouse 1 quest