Tradecraft

Tradecraft is a quest that can be obtained in the Commonwealth in Fallout 4.

Synopsis
Deacon asks the Sole Survivor for aid in reclaiming an important item from the Switchboard, the old Railroad headquarters. Successful completion results in an invitation for the Sole Survivor to join the Railroad.

Walkthrough

 * 1) Meet Deacon at the designated marker, under the highway west of Lexington.
 * 2) Follow him onto the highway, looking for Railmarkers. Some ghouls will get in the way.
 * 3) Follow the highway eastwards until Ricky Dalton.
 * 4) Talk to him using the passphrase "Mine is in the shop."
 * 5) Gather all the intel and talk to Deacon.
 * 6) Optionally, talk to Ricky again and convince him to share his supplies (some stimpaks, easy persuasion), provide sniper support (difficult), or storm the place as a distraction (very difficult and will annoy companions).
 * 7) Proceed to either storm the place through the front door or go through the escape tunnel. There is no impact on the quest itself, only the obstacles change.
 * 8) Inside the facility, head for the sealed vault in Department X.
 * 9) Carrington's prototype is inside. Collect it.
 * 10) Return to the Old North Church and talk to Deacon.

Bugs

 * Deacon will move at his own pace until the second Railmarker. Stick close to him to avoid having to retread the old way.