This is another quest assigned by P.A.M., which you can start after clearing the Mercer Safehouse quest. The quest will begin when she gives you an RFID Device to open a door leading to a DIA cache. The location of the door is at a random location.
In the case of our quest, we were led to the Mutant-inhabited Medford Memorial Hospital. As with most every Radiant quest for The Railroad, expect a lot of enemies.
Follow the waypoint to your objective. With the RFID device in your possession, you'll be able to unlock the door to the cache automatically. Report back to P.A.M. for your reward.