DetailsU sets were a class of intercity electrical multiple unit. The U sets were slightly different compared to the suburban single-decked trains that were running at the time. They were the first EMUs in NSW to feature the stainless-steel construction (earlier NSWGR EMUs featured painted mild steel or were of wood construction, of which was found on the "Bradfield" EMUs, also the oldest and first electric multiple units in NSWGR service at the time), improving train acceleration and giving the trains lower maintenance costs and a longer usable life.
