The invention relates to a bottom discharge arrangement (4) intended for mounting on a goods container (2) of a railway truck (1). The arrangement (4) includes at least one pair of flaps (5, 5') which are pivotally mounted on the goods container (2) at their mutually remote edges (6, 6'), so as to be able to swing between an open and a closed position in a plane perpendicular to the edges (6, 6'). The arrangement includes a two-arm lever (17) which is common to the link systems (8, 8') and which functions to maneuver the flaps (5, 5') simultaneously. The lever arm is pivotally mounted centrally at a point located centrally between the pivot axes of the flaps (5, 5') and is pivotally connected at one end to a first link (18) pivotally mounted on one flap (5) and at the other end is pivotally connected to a second link (19) pivotally mounted on the other flap (5'). When the flaps are closed, the pivot points between the parts (17, 18, 19) of the link system (8, 8') lie in an essentially forceless state of equilibrium in a common plane (20) which is locked in this state of equilibrium by means of an operating device (9) coacting with the link system (8, 8'). The operating device (9) functions to apply to the two-arm lever (17) a turning moment around its attachment point so as to bring the link system (8, 8') out of its state of equilibrium and therewith allow the flaps (5, 5') to open.