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  25
Jul
2014
Technical Reports
Evaluation of Wheel/Rail Contact Mechanics: Concepts Report
Author
          Mehdi Ahmadian and Michael Craft

Subject
                    Track,
                    Tracks & Structures,
                    Track/Train Interactions

**Keywords:** Roller Rig, Wheel-Rail Contact Mechanics, Rail Vehicle Dynamics, Contact Patch Dynamics, Wheel Forces and Moments
**Abstract:** A need exists for a new test rig design with advanced sensing technologies that will allow the railroad industry and regulatory agencies to better understand the wheel-rail...
Report Number
              DOT/FRA/ORD-14/28

  Office
              RDI-21
    24
Jul
2014
Technical Reports
Multifunction LIDAR Sensors for Noncontact, Speed, and Complex Rail Dynamics
Author
          Mehdi Ahmadian, Michael Craft and Cameron Stuart

Subject
                    Track,
                    Tracks & Structures,
                    Track/Train Interactions

**Keywords:** LIDAR, noncontact velocity measurement, curvature, alignment, ATGMS, track geometry, Railway Technologies Laboratory, Virginia Tech
**Abstract:** The results of an extensive series of tests are presented to evaluate the viability and applicability of LIDAR systems for measuring track speed, distance, and curvature in...
Report Number
              DOT/FRA/ORD-14/26

  Office
              RDI-21
    4
Apr
2014
Technical Reports
Quantification of the Effectiveness of Handheld Equipment for Ground Verification of Detected Rail Internal Defects
Author
          Leith Al-Nazer (Federal Railroad Administration), Dr. Thomas Raslear (Federal Railroad Administration), Lucas R. Welander (Transportation Technology Center, Inc.)

Subject
                    Rail and Infrastructure Integrity,
                    Track,
                    Tracks & Structures

**Keywords:** Ultrasonic phased arrays, conventional ultrasonic, rail flaw sizing, nondestructive testing
**Abstract:** The objective of this project was to quantify the effectiveness of the rail inspection ground verification process.  More specifically, the project focused on comparing the...
Report Number
              DOT/FRA/ORD-14/07

  Office
              RRD
    21
Mar
2014
Technical Reports
Performance Evaluation of Concrete Railroad Ties on the Northeast Corridor
Author
          Ronald A. Mayville, Liying Jiang, Matthew Sherman

Subject
                    Track,
                    Tracks & Structures

**Keywords:** Concrete railroad ties, alkali-silica reaction (ASR), delayed ettringite formation (DEF), impact echo, material analysis, prestressing tendons, degradation mechanisms, petrographic analyses, bursting and splitting forces, transfer strength and length
**Abstract:** Simpson Gumpertz & Heger Inc. conducted an investigation into the factors that caused widespread failure in prestressed concrete railroad ties on the Northeast Corridor. The...
Report Number
              DOT/FRA/RPD-14/03

  Office
              RRD
    18
Oct
2013
Technical Reports
Feasibility Study of Fiber-Optic Technology for Broken Rail Detection
Author
          Matthew D. Holcomb and W. David Mauger

Subject
                    Rail and Infrastructure Integrity,
                    Track,
                    Tracks & Structures

**Keywords:** Fiber Optic, Broken Rail, Acoustic, Seismic, Rail Break, Wayside Systems
**Abstract:** This report describes the activities and presents the results of a feasibility study to examine the viability of using fiber-optic acoustic technologies to detect broken rails in...
Report Number
              DOT/FRA/ORD-13/44

  Office
              RRD

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