Tradecraft

Tradecraft is a Railroad main quest and achievement/trophy in Fallout 4.

Detailed walkthrough

 * 1) Talk to Deacon and see what help you can provide.
 * 2) If you accept the job, Deacon asks you to meet him at Lexington's old highway. The marker is roughly between Drumlin Diner and Rocky Narrows Park.
 * 3) Deacon will be wearing a "wastelander camouflage". Talk to him and follow him along the broken highway (he will discuss the hidden signs Railroad members use to communicate with each other). Along the way to your "tourist" contact, watch out for ghouls.
 * 4) Once you reach the "tourist" contact, tell him the password and after the exhaustive dialogue choices, speak to Deacon.
 * 5) You will then be given the choice of a frontal assault or going in through the old escape tunnel.

Option 1: Escape tunnel

 * 1) Go back to where you met Deacon and then head for the quest marker. If you haven't picked it up yet, there's a suit of power armor on the train you go past, requiring an Advanced terminal hack.
 * 2) Once you enter the tunnel, you're given a little more information about the Railroad and the target.  Shortly after the talk, you'll find a Master level terminal which you have to hack to lift the security lockdown and proceed. Deacon will unlock this for you.
 * 3) Once past, Deacon will point out a railsign signifying that there's a cache nearby. It's in the back of the tube directly behind the sign.  Around here, Deacon will warn you to just run if you meet a Courser, provided the player hasn't previously fought one in the Hunter/Hunted quest.
 * 4) Ahead, there will be an unlocked terminal which you can use to turn off the spotlights and turrets.
 * 5) Once past that group, you'll be given a chance to turn on some defenses that will give you an edge against the next group of enemies. Shortly after that, you find out that the Railroad was using an old DIA site as their HQ.
 * 6) Next to the door leading out of the office area you go through, there's a terminal you can use to turn off the tripwires in the next room.  Before leaving, grab the fusion core in the room left of where you first entered and a U.S. Covert Operations Manual on a desk in the room up the stairs.
 * 7) If you go right, there's some bathrooms with a synth and a locked door with some loot.  After that, go left to continue the mission.
 * 8) A little further along, you'll hit an intersection; left leads to the mission marker, right to the "databanks," and straight to the front door where you would have arrived otherwise. Upon entering the databanks room, you will automatically pick up the unique weapon Deliverer. A terminal controls access to two locked areas containing minor loot.
 * 9) Once you enter the last room before the marker, Deacon will open the vault and inspect a dead body. There are two Hazmat suits and a Bottlecap Mine in the room before the vault, opposite a weapons workbench. After the inspection, he'll offer you the "hand cannon" the dead man used and won't take no for an answer. In the vault, grab Carrington's prototype, the two Stealth Boys, the Mini Nuke and head towards the elevator. Before you leave, to the right of the small set of stairs leading to the elevator is a locked door with an advanced lock where you can find another fusion core.
 * 10) You have two options to be able to leave the area and head towards the Old North Church.
 * 11) Option 1: Once out of the elevator, you get to kill all the synths you would have killed had you gone in through the front door.  There are also multiple turrets and a significant amount of mines littering the front of the building. Once you have killed the Synths you will need to head to the Old North Church to meet Deacon.
 * 12) Option 2: (Staying crouched is recommended) Once out of the elevator, you can walk up the stairs and kill three Synths on this level (two to the right of the stairs, one to left) plus destroy two turrets to the right of the stairs. Also, you need to destroy a turret at the level above you which can be seen thru the ceiling when entering the room on the right from the stairs. After this, there will be no enemies nearby so that you can fast travel to the Old North Church.
 * 13) Once back to the church, you find Deacon lying to Desdemona about your exploits. You have the option to tell the truth or pass an easy persuasion check to go along with the lie.  Once you make your decision to accept or refuse the invitation to join, the mission is complete.

Option 2: Frontal assault
If you choose this option, you will fight through all of the synths and the machine gun turret which are guarding the Slocum's Joe front entrance. You will also need to circumvent or disarm all of the mines littering the front of the shop. Once inside, however, Deacon will give you the location of the hidden elevator only to realize it has been powered down, forcing you to use the escape tunnel entrance despite your successful assault. However, it is still possible to enter this way by opening the elevator doors, jumping down the shaft, entering the elevator box via the hatch at its top, and opening the doors at the bottom. Careful of the mines in the hallway though.

Companion Reactions

 * Cait dislikes it if the player declines the gun or tells Desdemona the truth.
 * Curie dislikes it if the player goes along with Deacon's lie.
 * Curie likes it if the player declines the gun.
 * MacCready likes it if the player goes along with Deacon's lie.
 * Piper dislikes it if the player goes along with Deacon's lie.
 * Preston Garvey dislikes it if the player goes along with Deacon's lie.
 * Nick Valentine dislikes it if the player goes along with Deacon's lie.
 * Piper will dislike telling Ricky to make the distraction.
 * Piper likes it when you join the railroad
 * Deacon loves it when you join the railroad
 * Danse hates it when you join the railroad.
 * Curie likes it when you join the railroad.

Bugs

 * Deacon might stall in the hallway outside the room containing the locked vault and the inaccessible terminal. This can be prevented by following and clearing the dialogue tree at the start of the tunnel. To resolve the issue:
 * Save and reload the game, and optionally attack and down Deacon before doing so.
 * Exit the Switchboard via the Elevator and exit to the Commonwealth, upon re-entering the Switchboard via the elevator the vault should now be accessible
 * Deacon might stall upon first entering the Switchboard, failing to move upstairs to access the terminal and unlock the double-doors (an issue if the player doesn't have the Hacker Perk). Open the console and left-click Deacon. Close the console and go stand directly in front of the locked doors. Open the console and type "moveto player". The door should automatically open once Deacon is within close proximity.
 * When you are approaching The Old North Church to meet Deacon after getting Carrington's prototype, Deacon may suddenly move to the middle of the map making it impossible to meet with him. Loading a save game from the 'Get Carrington's prototype' step may solve this. Returning to the Switchboard to find and speak to Deacon there may also solve this.
 * The prototype may not be removed from the inventory after handing it over to Carrington. Talking to him a second time or, on PC, using may fix this issue.
 * Deacon might get stuck in mid air, unable to speak or move, after the player has talked to him under the old highway. A way to fix this would be to target him, open the console, and type . This will fix Deacon floating around.

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