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Mechanics of Ballast Compaction Volume 3: Field Test Results for Ballast Physical State Measurement

The important mechanical processes which influence the ballast physical state in track are tamping, crib and shoulder compaction and train traffic. Three methods of assessing physical state were used at four railroad sites to obtain needed data on the effect of these processes. The methods were:...

Mechanics of Ballast Compaction: Field Methods for Ballast Physical State Measurement

Field methods for measuring ballast physical state are needed to study the effects of ballast compaction. Following a consideration of various alternatives, three methods were selected for development and evaluation. The first was in-place density, which provides a direct measure of compaction. An...

Installation of Active Noise Control and Active Vibration Control on a GP40-2 Locomotive

This project evaluated the performance of active noise control (ANC) and active vibration control (AVC) technologies using a GP40-2 locomotive located at the Transportation Technology Center (TTC) near Pueblo, CO, to determine the applicability of ANC and AVC technologies in the rail industry....

Observations of In-Service Wear of Railroad Wheels and Rails Under Conditions of Widely Varying Lubrication

Some of the wheel and rail wear results from the current test at the Facility for Accelerated Service Testing are analyzed in the light of both adhesive and fatigue wear theories. This analysis suggests that the wheel:rail wear processes occurring in the unlubricated state are affected by more than...

Long Term Assessment of Passenger Ground Transportation System Technology

In this study advanced intercity ground transportation has been reviewed to establish the present status and future directions of worldwide technology development. The study has focused in detail on noncontacting types of suspension and propulsion technology while citing significant developments...

Interaction and Load Transfer in Track Support Structures, Part 2: "Testing and Constitutive Modelling of Materials and Interfaces"

This final report is presented in two parts, and is in continuation of two previous reports prepared under this contract. Part 1 contains details of the development of finite element procedures for nonlinear analysis of track support structures. It provides the user options for using one-, two- or...

Interaction and Load Transfer in Track Support Structures, Part 1: One-, Two- and Three-Dimensional Nonlinear Soil-Structure Interaction Finite Element Procedures and Verification

Initial Experiment Territory Definition for Locomotive Evaluator

[From Overview] The effort on this project was divided into three phases. The purpose of Phase I was to investigate several railroad accidents that were attributed to poor train handling. The results of this investigation were used to establish a potentially difficult train handling scenario to...

Improvement of Railroad Roller Bearing Test Procedures and Development of Roller Bearing Diagnostic Techniques Volume I: Acceptance Test

Bearing defect data from 8,000 railroad roller bearings are analyzed to determine their defect modes and defect rate distributions. Cone bore growth, brinelling, and fatigue are identified as the predominant defect modes during the first 12 years of the aging process. The results of the study show...

Harmonic Characteristics of Rectifier Substations and Their Impact on Audio Frequency Track Circuits

This report describes the basic operation of substation rectifier equipment and the modes of possible interference with audio frequency track circuits used for train detection, cab signalling and vehicle speed control. It also includes methods of estimating EM noise received by track circuits from...

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