Trigger this Radiant quest by speaking to P.A.M. at Railroad HQ.
She will ask you to clear a random settlement of hostiles and to secure it with two basic turrets. In our version of the quest, we were led to an area very close to the Taffington Boathouse.
After you've placed the second turret, report back to P.A.M. for your reward. If Doctor Carrington and Desdemona are with P.A.M., you'll have the opportunity to trigger the Memory Interrupted quest. You can also take this time to take on P.A.M.'s next quest, Jackpot.