EDIT: It seems ‪@inspectortalon‬ and ‪@maidofmoss‬ figured this design out before I did! Be sure to check them out!

Here I present two designs for 1wide, tileable stacked minecart separators. These designs are extremely simple and compact.

I first saw the design by ‎‪@inspectortalon‬ featured at start of video in CartMIS™ by ‎‪@RaPsCaLLioN1138‬ and Talon:
   • 16x Faster CartBased MultiItem Sort...  

Check out ‎‪@inspectortalon‬ for great videos on minecart tech!