My understanding is that the Longreach titles were applied to the -400s. In 1989 Qantas flew a -400 "City of Canberra" direct from Heathrow to Sydney hence the Longreach title. As 172driver points out it is also a town in Queensland that has a significant connection to the beginnings of Qantas(thats what the Q stands for and why you dont spell Qantas with a U) It is also the home of the Qantas Founders museum. The SUD was dropped from the -300 early in its commercial service and became the EUD. By the time the -400 came around the bigger upper deck was just accepted and not a big deal.