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                    Over 6000 U and K wagons
                  were built from 1921 to 1946. The U had underfloor hopper
                  outlets, the K had a plain floor. Various sub-classes were
                  modified from the basic wagons: KH (four hoppers only), KF
                  flat wagons, RU (new build wheat hoppers to same basic
                  design); UT (coal wagons for rotary tippler) and others. They
                  remained in traffic until the 1970s and form an essential part
                  of any mid-20th century NSWGR model scene. 
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