A short code used to indicate the car’s next destination.
A train yard in which cars get sorted according to their next destination.
A bolster bowl shim is a round piece of mild steel placed in the bolster bowl to raise the center plate. Shims were once permitted for used on cars with 263,000 lb gross rail load or less, but due to their misuse on heavier cars shims are now prohibited on all cars. Instead, horizontal wear liners made of various thicknesses of hardened steel must be used instead of shims.
A horizontal wear liner is a heat treated steel disc that protects the bolster bowl from wear caused by the body center plate. Available in various thicknesses, multiple wear liners may be used to adjust clearance between center plate and bolster bowl rim.
Caution: Horizontal Wear Liners must not be confused with bolster bowl shims, which have a very similar appearance but are not heat treated and are no longer acceptable for use on freight cars in North America.