A possible center for train network roundabouts in some cloverleaf style. It may not be the most efficient center for a roundabout. But it gets the job done, depending on how you want to set up your railway network. It has optional feedback trails in the center e.g. for a train to loop straight back to where it came from.

*WARNING: Modded This was created using the bigger blueprint designer mod. It is too big to fit into the standard blueprint designer.