HO NGBA Bogie Grain Hopper SRA #32117Bogie Coal Hopper BCH were built to transport the expected increase in coal production from the Western Coal Field. When the traffic did not eventuate, it was found that the hoppers were not suitable for loading at many of the then existing mines, so they were converted for hauling bulk wheat and carried the designation BCW. The wagon represents the once most numerous type of bogie coal hopper on the NSW railways, and the crucial relationships between