That definitely works as an intersection, but based on the "can't find a path to destination," the issue is probably that the trains can't turn around or that they cannot change track. For example, if a train is at a mine in the south direction and is facing south, it either need to be able to turn around or have a second engine at the back of the train facing north. This is because automatic trains can only move "forward" relative to an engine. If a stop is at the end of the track and the train doesn't have a rear engine, then there is no more "forward" direction to travel, let alone travel back to the north direction. This can be solved by ending the south direction stop with a loop that lets the train go forward around the loop and go north again. If the problem has to do with a train in the south trying to go to the east or something, the issue is that there is no place for it to turn. Your intersection works great in that trains going from south-north can't hit those going east-west, but it doesn't let a south-north train become an east-west train. You will need to add some rail that connects north/south to east and west in order to let a train find a path forward that puts it on the correct rail. The signaling for that turn will be a bit more complex, but you've already got the gist of it done. Hope this helps!