Tiny trains for your tiny needs. Makes rails and wagons 1 wide, and shortens the wagons to 3 height. Now you can fit a train in between your assemblers and beacons. Rails still move on a 2x2 grid.
I have a simply set up testing your tiny trains with a loco at each end and a stop at each end of one track. It says cant find path. I have the same set up for nomral trains it works. Am I doing something wrong? The stops are on the correct sides.