Én azt olvastam, ha nem vagy RR-tag (vagyis nem volt náluk az első küldetés Deaconnal) baj van.

If one is not allied with the Railroad before visiting the Institute, they will no longer trust the Sole Survivor, and will not let them join their faction. Along with story considerations, this may mean that one will never be able to build ballistic weave for the clothing.

In order to build the interceptor with the Railroad, they will ask you to complete Tradecraft and join their organization.