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Athearn RTR 1392 HO Scale Bathtub Gondola w/Load Wisconsin Public Service WPSX 3-Pack #2 HWI CAR Durable plastic roll cageAthearn RTR 1392 HO Scale Bathtub Gondola w Load Wisconsin Public Service WPSX 3 Pack #2 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