Athearn HO ATH-1400 Berwick Bathtub Gondola with Load, DJJX Primed For Grime #30100/30106/30115 (3

With the advent of rotary dumpers, the bathtub gondola allowed the railroads to haul more bulk cargo per carload than conventional open top hoppers. The absence of unloading gates and other appliances that affect internal capacity allowed for additional capacity per car. This improved transportation efficiency for these assigned service cars. The term “Bathtub” gondola is due to the internal shape of the car.