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            Evaluation of Longitudinal Wing Slopes for No. 20 Frogs
      

      
  Document Series
              Research Results


      
  Author
          Federal Railroad Administration


      
Report Number
              RR 22-39

  Office
              RDI-21


      Subject
                    Track


      
  Keywords
              Wing slope, special trackwork, turnout frogs, frog point, HAL


      

      
      
              
                  
      
              
  Document
              Longitudinal Wing Slopes.pdf (482.95 KB)

      
              In a collaboration between the Federal Railroad Administration (FRA) and the Association of American Railroads (AAR), Transportation Technology Center, Inc. (TTCI) investigated the benefits of modified No. 20 frogs on mitigating damage to the frog point, heel, and wing rails under heavy-haul operations. This long-term study, which began in 2013, is being conducted on a heavy-haul mainline in the eastern United States. The latest iteration began in 2019 and focused on evaluating longitudinal wing slopes in No. 20 frogs. Results to date have not conclusively shown that the wing designs help mitigate the studied issues. It is likely that additional tonnage may be required to demonstrate a clear benefit.
      
            
      
      
              Last updated: Tuesday, November 22, 2022 U.S. DEPARTMENT OF TRANSPORTATION

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