Technical Reports

An Investigation of Techniques for Validation of Railcar Dynamic Analyses

A linear model of the vertical dynamics of a railcar was validated by the application of spectral techniques to experimental data. Track input spectra were computed from test track surface measurements gathered in the TDOP test program. Acceleration measurements of a freight car were used to...

Tread Metal Buildup on Railroad Freight Car Wheels- Dynamometer Simulation

Recent dynamometer tests on a composition metal brake shoe with a high metal powder content developed slight tread metal pick up during testing at the Federal Railroad Administration's Transportation Technology Center. Additionally, the brake shoes and wheels that developed tread metal buildup...

Safety of Railroad Passenger Vehicle Dynamics: OMNISIM Simulation and Test Correlations of Passenger Rail Cars

The purpose of the work is to validate the safety assessment methodology previously developed for passenger rail vehicle dynamics, which requires the application of simulation tools as well as testing of vehicles under different track scenarios. This report specifically addresses the evaluation of...

Correlation of Concrete Tie Track Performance in Revenue Service and at the Facility for Accelerated Service Testing : Volume II Predictions and Evaluations of Track Settlement

Predictions and evaluations of settlement were made for revenue and the Facility for Accelerated Service Testing (FAST) track, both containing concrete and wood tie sections. The ballast physical state were investigated by field tests done before and after track maintenance. Borings were also taken...

Correlation of Concrete Tie Track Performance in Revenue Service and at the Facility for Accelerated Service Testing : Volume I

This report is the first of three volumes which describe a comparative study of concrete tie track in U.S. revenue service and at the Facility for Accelerated Service Testing (FAST). The work was undertaken to develop an understanding of the degree to which FAST represents the "real world" of...

Propagation Analysis of Transverse Defects originating at the Lower Gage Corner of Rail

This report describes analyses performed to examine the growth rate of a particular transverse defect that forms in the rail head. The most common transverse defect found in rail, known as the detail fracture, has been studied in previous work. The present analyses, however, focuses on another...

Parametric Studies on Lateral Stability of Welded Rail Track

Thermal buckling of railroad tracks in the lateral plane is an important problem in the design and maintenance of continuous welded rails (CWR). The severity of the problem is manifested through the increasing number of derailments which are attributable to track buckling, indicating a need for...

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...

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Technical Reports