Kadee 501 HO Scale Arch Bar Trucks w/ 33" Ribbed Back Wheels Metal Fully Sprung

#501 Arch Bar Trucks with 33" Ribbed Back Wheels - HO Scale Metal Fully Sprung Equalized Trucks Mounts with a #2 or 2-56 screw. Mounting Screws not Included. Commonly used 1890?s and early 1900?s - Allowed in interchange service until about 1941. The Arch Bar Truck is typical of these trucks from around the turn of the century. Despite the age of these trucks, they saw more than seventy years of service in some applications. The arch bar was allowed in interchange service until about 1941. On railroads that were not common carriers such as logging or other industrial lines, this restriction of the trucks did not apply since the trucks did not operate on rails other than the owner's. The Northern Pacific, for example, used truss rod frame maintenance of way cars fitted with arch bar trucks well into the early 1970's. Many logging railroads also used them at least until then. Screws not included One Pair UPC: 765484005018