52 CENTER-BEAM FLATCAR with BULKHEADS - BC RAIL #52423 - HO Scale. Center-Beam Flatcars, (sometimes called center partition railcars) were designed for carrying a variety of banded building materials such as dimensional lumber, wallboard, fence posts, etc. The sturdy end walls called Bulkheads, prevents the loads from shifting past the ends of the flat car. The Center-Beam Flat Cars with Bulk heads appeared in the 1960’s and are still in use today. Bachmann’s Center-Beam Flat Cars with Bulkheads come fully assembled and features; Highly Detailed Painted Bodies with Precision Graphics, Blackened Machined Metal Wheels with RP 25 Contours, Magnetically Operated E-Z Mate Couplers, Non-magnetic Blackened Brass Axles with Needle-point Bearings, Celcon Trucks, and Added Weight for Optimum Tracking Performance.