Our DC runs mostly 48x40 GMA pallets, and I’ve heard it traces back to WWII railcar sizing — anyone know the real origin and whether the footprint was about forklift tine spacing or box-stacking efficiency? I’m asking because it changes aisle math and safe turn radius; on a Crown reach we keep about 3 inches clearance per side in a 96-inch bay, and those oddball 42x42s always mess the inventory count and rack stops.