Properties: -4 Double-track railsways -Minimal ramps (7) -Minimal rail supports (6) -Very compact -Every destination has 3 merge points only (Minimal) -Very short, meaning that distance between each two opposite entrances is short (good for tight lengths) -Space efficient
Downsides: -not symmetrical -No return loop (only 3 directions per rail)
notes: -i have not tested the throughput but i assume its good because of signaling that separates lines in different directions so that they dont interfere with each other and because of minimal signaling.