General

Track Stiffness Measurment System Evaluation Program

This report describes a three-phase program to devlop and evaluate an on-board, track stiffness measurment system. High correlation has been established between observed variations in track stiffness signatures and the actual conditions of track strcutrues and subgrade. Track stiffness and track...

Development of Techniques and Data for Evaluating Ride Quality Volume II: Ride Quality Research

Ride-quality models for city buses and intercity trains are presented and discussed in terms of their ability to predict passenger comfort and ride acceptability. This, the second of three volumes, contains a technical discussion of the ride-quality models developed during the research effort using...

Vertical Track Modulus in Plastic Composite Tie Test Zones at FAST

Transportation Technology Center (TTCI) conducted vertical track modulus tests on existing plastic composite tie test zones on the High Tonnage Loop (HTL) at the Federal Railroad Administration's (FRA) Facility for Accelerated Service Testing (FAST), Pueblo, Colorado. Warm and cold weather tests...

Catalog of "Common Use" Rail Corridors

This report is a catalog of 'common use' rail corridors. These are defined as corridors where non-Federal Railroad Administration (FRA)-compliant light rail or rail rapid transit vehicles operate adjacent to, or on track shared with, rail freight or passenger operations coming under FRA safety...

Thermal Measurements of Commuter Rail Wheels Under Revenue Service Conditions

The report documents the test objective, procedure, and equipment used during the execution of the New Jersey Transit Operational Field Test conducted under the FRA Cracked Wheel Investigation. The report also includes a presentation of all data gathered during the test procedure and illustrates...

Thermomechanical Testing and Microstructural Development of Class L Steel Wheel Alloy

Macrostructure, microstructure, and quantitative metallographic analysis is conducted on Association of American Railroads Class L wheel steel specimens tested in a Gleeble 1500 under combined mechanical compression and resistance heating to temperatures above and below the austenite transformation...

Results and Analysis of the Switchyard Impact Tests

This report presents the results and analysis of series 3 through 7 and series 10 of the FRA/RPI/AAR Switchyard Impact Tests. The test results and analysis are used to evaluate the head shield and the shelf-E coupler as protective devices for hazardous materials tank cars.

Preliminary Analysis of the Effects of Non-Linear Creep and Flange Contact Forces on Truck Performance in Curves

Prediction of wheel displacements and wheel-rail forces is a prerequisite to the evaluation of the curving performance of rail vehicles. This information provides part of the basis for the rational design of wheels and suspension components, for establishing criteria for maintenance of track and...

Railroad Wheel Residual Stress Detection Program- An Evaluation of Residual Stress in Cast Steel Railroad Wheels using Electromagnetic Acoustic Transducers (EMATS)

A nondestructive testing (NDT) method to determine the residual stress in the rims of cast steel railroad wheels has been evaluated by the Association of American Railroads (AAR). The National Institute of Standards and Technology (NIST) has developed an ultrasonic system which uses electromagnetic...

Passenger Rail vehicle Safety Assessment Methodology Volume II: Detailed Analyses and Simulation Results

This report presents detailed analytic tools and results on dynamic response which are used to develop the safe dynamic performance limits of commuter passenger vehicles. The methodology consists of determining the critical parameters and characteristic properties of both the vehicle and the track...

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General