Original sentence: Janney (AAR).Meatchopper couplings of various kinds, which are obsolete
Edited sentence: Janney (AAR) - an automatic type used throughout the contiguous Southern African network.Meatchopper couplings of various kinds, which are low in strength and obsolete.Modern wagons are usually built with drawgear designed for easy conversion to some kind of centre coupling such as the AAR or SA3.SA3 - an automatic type.Similarly with coupling adaptors