Rail Junction

Rail Junctions are a railway item in Astroneer. They allows for the creation of rail line junctions that splits rail lines in three directions.

Source
Rail Junctions are placed from a.

Uses
Placing a Rail Junction within range of another Rail Post or Junction will connect a rail line between them, deforming any terrain that might be in the way.

Rail Junctions may be placed on any terrain, allowing for placement on walls and ceilings of caves.