This guide will explain how to complete the steps in the Fallout 4 Institute Quest: End of the Line. Receiving this quest means you have fully aligned with the Institute and are prepared to carry out their primary objective. Follow the steps in this guide to proceed with the next part of the faction’s plans.
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This quest involves an important sequence of end-game events. Only complete this quest if you wish to know details regarding the main story ending that occur as the result of siding with the Institute faction. Even the quest objectives contain spoilers, so read this guide at your own risk.
Speak with Father
After completing the objectives in the previous Institute Quest: Powering Up, locate Father in the Institute and speak to him about the next steps of the plan. The Institute is prepared to eliminate those who stand in the way of their cause.
In order to ensure the success of the Institute’s plans, Father has tasked you with eliminating each of the Railroad faction leaders. Given that you have come this far with the Institute faction, you must be willing to eliminate threats to the Institute at all costs, even if it involves cutting ties with those you have previously had friendly relationships with in the past.
Fast-travel out of the Institute and head to the Old North Church in Boston. Enter through the back door of the church, and make your way down to the basement level. Prepare yourself for the fight ahead by equipping some heavy firepower, and stocking up on ammunition.
Locate the Freedom Trail Ring on the brick wall within the crypts beneath the church. If you have not yet activated this ring, spin the wheel to spell “Railroad”, making sure to press the button after each letter to input the password. This unlocks the secret entrance to the Railroad HQ.
Pass through the tunnels until you reach the door to the Railroad HQ. Enter the headquarters to locate Desdemona. If you have had previous dealings with the Railroad, you can speak with Desdemona if you wish, but it’s too late to change your allegiance at this point. Kill Desdemona, then locate the other Railroad leaders within the HQ.
Eliminate the Railroad Leaders
Opening fire on Desdemona will cause the entire Railroad HQ and its agents to turn hostile. Eliminate Desdemona, then proceed to do the same to each of the other primary Railroad leaders, including Deacon, Glory, Drummer Boy and Tinker Tom.
Speak with Father
Defeat the remaining Railroad agents within the headquarters, and then fast-travel back to the Institute. Locate Father in his quarters, and inform him of your progress. As he begins to mention your next task, the quest concludes, and the Airship Down quest will begin.