Abstract: A fabricated center filler and center plate construction for the underframe of a railway car in the area where the body bolster intersects the center sill. The fabricated center filler includes four interconnected, vertical walls and a bottom floor plate secured by welding thereto. The center filler is secured by welding to the vertical sidewalls of the center sill with the floor plate of the center filler positioned flush with the lower surfaces of the center sill flanges. Opposed ends of the center filler floor plate preferably are overlapped by portions of the bottom cover plate of the bolster and are secured by welding hereto. A king pin receiving tube is secured by welding within a hole formed in the floor plate of the center filler, the tube having its upper end positioned within the confines of the center filler and having its lower end positioned below the floor plate.