BOX High-sided bogie open wagon. Side discharge arrangement. 55 ton capacity, 25 ton tare. Used for coal and other bulk goods. About 7,000 of these are in use [2006]; this class is in decline since the advent of the BOXN and other variants. There used to be over 14,000 of these in the 1990s, and about 8,800 as late as 2005.