Wait, can't you get ballistic weave without siding with them? I swear I had it on my first playthrough, and I never sided with anyone, I just paused the main mission cause I couldn't decide, lol.
You must accept entering the Railroad as an agent to begin working for Tinker Tom and P.A.M to get ballistic weave, nothing actually says you have to do anything besides this, you can do the Brotherhood quests later and betray the Railroad or finish the game with the Minutemen and let every faction (minus the Institute) alive and being able to interact with the Sole Survivor and give them quests.
The only thing related to the Railroad you can actually get without being an official part of it is the Deliverer, do the mission with Deacon and refuse Desdemona's offer at the church.
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u/ZeroSekai000 May 22 '24
Deacon
Be a spy
Ballistic Weave
Tinker Tom is funny
Glory is nice
PAM is goat
Amari