Can anyone speak to NH baler generations?

Today I was pushing my 311 pretty hard and was pleased with the results. I raked it up pretty thick to save time and was very happy with the bales in 3rd gear. Can anyone dilineate at which models these balers became higher capacity in each generation? I know mine is not a 5070, but what number did each abler series become higher capacity? Thanks!

Can anyone speak to NH baler generations?