A balanced 4 belt to 6 belt splitter for Factorio 0.15.x
Optimal for train loading, this design splits four belts into six while balancing both the output load and amount taken from the four feeding belts. Each train car can be fed by up to 6 inserters and has 1 space between it and the next car. This means that any 6 belt system feeding each car can be no more than 7 spaces wide. Well, you’re in luck — this design is 7 spaces wide! Stick it in a blueprint than copy/paste the belt balancer to each spot that a car will be loaded and let your construction robots do the work.