3D spatial relator for creating minecraft rails

@dmitribagh and @mark2catsafe created a railway in minecraft using a spatial relator to examine adjacent points to determine the orientation for the rails. See https://knowledge.safe.com/articles/1064/how-to-make-minecraft-worlds.html. However the "complicated" condition definition for adding the block attributes only works in 2D and does not incorporate in z data for elevation or slope of the rails. Does anyone have some thoughts/ideas about how to expand on the condition definition to add the slope attributes? e.g. 2 Sloped rail ascending to the east. 3 Sloped rail ascending to the west. 4 Sloped rail ascending to the north. 5 Sloped rail ascending to the south.