I wanted a way to use more than a single Ice Line for Sulfur Cube Rail lines, so I worked on a Track switcher that opens Sulfur Cube Monorails to 3 directions instead of 2, There's weird interactions with Honey Blocks where Sulfur Cubes will stick to them or sink in them if they're on a honey block and then interact with a slime block launcher, That's why it's so large, that and I just got something working but am not a Redstone Genius by any means. The mechanism works much like a triple piston extender, first pushing the Launcher for the T intersection below the track, then lowering the desired launcher in, and firing it, then retracting everything in reverse order (thus the triple piston extender comparison) The buttons for <---> Travel also retract Redstone blocks that power a Sulfur Cube stopper so the Cube is in position to fire. The stoppers themselves lower both <---> launchers when the Sulfur Cube passes over a pressure plate, with a piston arm on a 3 tick delay doing the trick for everything else. If you have suggestions on how to improve this design I'd be really appreciative to hear them, I just wanted to get a proof of concept out there in the hopes that someone does it better XD

Linked is an explainer, it's not a let's play, but I am a bit wordy and afraid to put it in my first post, but it can go into more detail than I can express in images, if I'm in violation, my sincerest apologies.  
[https://youtu.be/h0atLXws6Lw](https://youtu.be/h0atLXws6Lw)

Sulfur Cube Monorail Track switcher