I like the Railroad quest line precisely because they are so committed to their goal. They are scrappy, survivors and have the opinion that if you create something that can think for itself, then it should be given free will. And like any free-thinking person, that free will might lead you to be a [censored] human being, hence the illustrative case of the synth Raider leader. I thought that was well done, because if you are an institute kind of person, you are all "see, giving synths free will is bad" but if you are a RR person its more "Giving sentient beings their freedom means they can make good or bad decisions, like anyone else."
My question is - a bit spoilery, I have stayed loyal to the RR, and my current task is still to "Work with Father", so keep playing along... as a result, I have done the Mass Fusion quest for the Institute, though not handed it in after finishing the objective last night. After I do the turn in, will the RR get ready to make a move at that point? I just want to make sure I stay on track with the RR this run-through, as that is my choice. Also, it is so so much fun to ice the BOS peeps, especially those in power armor. HA!
Edit: Also, the hippy robot you find was not at all related to the Railroad, if you read up on stuff around there, it was some sympathetic goofballs, but I am pretty sure the railroad would not want a bunch of high goofballs in their organization, blowing their cover easily. hahaha.