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52550
  
  

  12
Feb
2024
Research Results
Expansion of Rail Flaw Library at the Transportation Technology Center
Author
          Federal Railroad Administration

Subject
                    Track

**Keywords:** Rail, rail wear, rail defect, rail flaw library, ultrasonic testing, UT, phased array ultrasonic testing, PAUT, Miniprof, Rail Flaw Library of Associated Defects, RF-LOAD, non-destructive evaluation, NDE, track

Report Number
              RR 22-36

  Office
              RDI-21
    21
Jul
2023
Research Results
Modeling Track Mechanical Behavior with Under Tie Pads and Under Ballast Mats
Author
          Federal Railroad Administration

Subject
                    Track

**Keywords:** Under Tie Pads, Under Ballast Mats, Finite Element Analysis
**Abstract:** Under the sponsorship of the Federal Railroad Administration (FRA), researchers at the Volpe National Transportation Systems Center developed a finite element (FE) track model...
Report Number
              RR 23-10

  Office
              RDI-21
    14
Jul
2023
Research Results
Development Length Variables in Pretensioned Concrete Ties
Author
          Federal Railroad Administration

Subject
                    Track

**Keywords:** : railroad ties, indented wire geometry, development length, flexural capacity, prestressed concrete, moment capacity

Report Number
              RR 23-09

  Office
              RPD-21
    17
Feb
2023
Research Results
Railroad Bridge Inspection Using Drone-Based Digital Image Correlation
Author
          Federal Railroad Administration

Subject
                    Track

**Keywords:** Autonomous drone flight control, stereo digital image correlation, remote bridge inspection

Report Number
              RR 23-02

  Office
              RDI-21
    22
Nov
2022
Research Results
Evaluation of Longitudinal Wing Slopes for No. 20 Frogs
Author
          Federal Railroad Administration

Subject
                    Track

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

Report Number
              RR 22-39

  Office
              RDI-21

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