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52550
  
  

  13
Sep
2023
Technical Reports
High-Strength, Reduced-Modulus, High-Performance Concrete for Prestressed Concrete Crosstie Applications
Author
          Federal Railroad Administration

Subject
                    Track

**Keywords:** Concrete, crosstie, weathered aggregate, granite, modulus
**Abstract:** High-performance concrete (HPC) with early strength development is the material of choice for fabricating prestressed concrete railroad ties. However, the higher strength of...
Report Number
              : DOT/FRA/ORD-23/26

  Office
              RPD-21
    7
Sep
2023
Technical Reports
Characterization of Track Geometry for Various Operational Conditions
Author
          Federal Railroad Administration

Subject
                    Track

**Keywords:** Track geometry, track quality, track irregularities, space curve, Automated Track Inspection Program, ATIP, Power Spectral Density, PSD, clustering
**Abstract:** This report characterizes the amplitude and wavelength content of the current track geometry environment of the United States railroad system and examines the combination of...
Report Number
              DOT/FRA/ORD-23/25

  Office
              RDI-22
    21
Aug
2023
Technical Reports
Autonomous Inspection System Based on Passive Sensing and Anomaly Detection
Author
          Federal Railroad Administration

Subject
                    Track

**Keywords:** Ballast moisture monitoring, fouled ballast monitoring, passive sensing system, frequency doubling reflectenna, sequential change detection, deep neural networks, machine learning, artificial intelligence, high-frequency electrical simulation models
**Abstract:** Detecting poor track conditions before they become safety-critical is essential for improving the safety and efficiency of railroads. To this end, autonomous track inspection...
Report Number
              DOT/FRA/ORD-23/23

  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
Technical Reports
Unsaturated Characteristics of Fouled Ballast to Support in Situ Identification of Fouling Using Ground Penetrating Radar – Phase II
Author
          Federal Railroad Administration

Subject
                    Track

**Keywords:** Ballast stability detection technology, suction water characteristic curves, large-scale direct shear, complex impedance, ballast fouling, track
**Abstract:** The Federal Railroad Administration funded researchers from Kansas State University and the University of Arkansas to establish the electromagnetic, suction, and strength...
Report Number
              DOT/FRA/ORD-23/18

  Office
              RDI-21

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