Draft sill with locking center pin

A draft sill end casting with a locking center pin is disclosed. The draft sill has an open member with an elongate channel aligned with the central aperture of its center plate. A support shelf is within the elongate channel. A center pin has an upper retainer key supported on the shelf, and the center pin extends through the elongate channel to the exterior of the draft sill. The lower end of the center pin has a slot. When mounted on a truck bolster, a lower retainer key is slid through slots in the bolster walls and through the slot in the lower end of the center pin. The two retainer keys, support shelf and bolster walls lock the center pin in position, limiting axial movement of the center pin and limit rotation of the center pin. Thus, the draft sill and truck bolster are locked together to limit relative vertical and horizontal movement between them. The shelf may include rotation stops to limit rotation of the upper retainer once it is in place. The draft sill includes a key passage so that the upper retainer key and center pin can be removed if desired. In two embodiments, the key passages are through the support shelf and lead to the exterior of the draft sill; in these embodiments, the center pin and retainer key can be removed from the draft sill as a unit. In another embodiment, the key passage is formed as a slot in the interior wall of the draft sill above the support shelf; in this embodiment, the retainer key and center pin must be removed independently of one another.