Performance of Prototype No. 20 Frogs in Revenue Service
Transportation Technology Center, Inc. (TTCI) evaluated the performance of several No. 20 fixed-point frogs on Norfolk Southern Railway (NS) in Kentucky. This effort was part of the Heavy Axle Load (HAL) Revenue Service Test Program jointly supported by the Federal Railroad Administration (FRA) and Association of American Railroads (AAR). Research was conducted between 2017 and 2022.