If you go through the Railroad story line but get banished from the Institute, Desdemona will tell you that the Minutemen are the synths' last hope. However, the Railroad does nothing to help the Minutemen, despite having a lot to gain from the Minutemen succeeding. I think it would be cool to have Railroad agents fight alongside the Minutemen in the Minutemen version of the Nuclear Option, given that the player initially went with the Railroad but ended the game with the Minutemen. I don't know how easy this would be to accomplish, or if it's even possible, but I think it would make a lot of sense for the Railroad to do whatever they could to take out the Institute.
Edit: Maybe also have Z1 and the synths help in the fight, assuming you've assisted them.
Edited by DukeDvl69, 05 April 2020 - 10:45 PM.