 A further seven X class locomotives were built in 1938, a followed by a further six in 1942–43, with a final four X class delivered by 1947.The X class locomotives were described as always the master of their task, fast steaming and easy riding.With their relatively heavy axle load, the X class was initially confined to the Bendigo and Wodonga lines, with the occasional journey on the Ballarat or Geelong lines.