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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Performance of Prototype No. 20 Frogs in Revenue Service

Document Series
Research Results
Federal Railroad Administration
Report Number
RR 22-17
Subject Track
Special trackwork, turnout frogs, frog point, frog wing, HAL

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.  

Last updated: Friday, September 9, 2022