Hello all,
Hey I looked through the forums and it seems this question never came up?
(Or maybe it's just a dopey question, heheh...)
But I have a couple of Railroad quests to turn in, and I was about to go into the Church - in full BoS T-60b, with Danse in tow.
Does anybody know, would this be... problematic?

Nah, it's ok to bring Danse and power armor (though I hear that the targeting HUD mod causes issues in some situations).

The only companion you can't bring into the Railroad HQ is X6-88. Well, you can, but it'll be a... trainwreck (ba dum tss).

Danse doesn't care, he has a lot of comments regarding the RR just like other companions if you bring him there.