Technical Reports

User's Guide to Fatigue Life Analysis Program (FLAP)

This guide documents the use of the Fatigue Life Analysis Program which is intended for use in the implementation of the Interim AAR Guidelines for Fatigue Analysis of Freight Cars. This computer program is a tool by means of which the freight car design engineer can readily incorporate fatigue...

U. S. Transit Track Assessment and Research Needs

This report covers a study of transit track made as part of the current research effort of the Urban Mass Transportation Administration of the U.S. Department of Transportation. The study was initiated to identify new technology and research tasks that may help increase the performance, reliability...

Truck Design Optimization Project Phase II: Friction Snubber Force Measurement System (FSFMS) Field Test Report

This report documents the results of the Friction Snubber Force Measurement System (FSFMS) special road test program that was performed during TDOP Phase II. The FSFMS was designed, built, and shop-tested during TDOP Phase I (see FRA/ORD-78/69). Descriptions of the test equipment, procedures,...

Truck Design Optimization Project Phase II: Analytical Tool Assessment Report

One of the objectives of the Truck Design Optimization Project (TDOP) Phase II is to define the performance of newer Type II freight car truck designs versus the standard, three-piece Type I truck. To accomplish this dynamic performance evaluation, TDOP Phase II will utilize field test data and...

Truck Design Optimization Project (TDOP) Phase II: Phase I Data Evaluation and Analysis Report

As part of the TDOP Phase II project, the FRA directed Wyle Laboratories to evaluate and analyze the test data acquired during TDOP Phase I for use in Phase II model validation and specification of performance indices. These data were contained on 204 magnetic tapes and computer printouts. The...

Track Structures Volume IV: Effects of Track Geometry (Irregularities) on Dynamic Behavior of a Railway Vehicle on Tangent Track

The objective of this report is to evaluate the effects of various track irregularities on the dynamic behavior of railway vehicles moving over tangent track which meets the FRA standards. Two different freight cars are used for the study. The peak to peak roll angle of the carbody, center plate...

Track Structures Volume III: Study of Effects of Spiral Length on Simple Curve Negotiation

Simple curve entries with/or without spiral for different curves are analyzed using the Quasi-Static Lateral Train Stability Model. The effect of spirals on maximum L/V ratios and coupler lateral angles in simple curve entries is investigated. The effect of buff force on lateral train stability...

Track Geometry Measurement by High-Rail Vehicles

This report examines the capabilities of a high-rail track survey vehicle to: 1) Assist in improvement of the track safety inspection program; and 2) Assist in data collection for transportation planning. The project examines both technical and operational aspects of high-rail vehicle usage as an...

Track Component - Property Tests Volume I - Rail, Tie and Fasteners

This report describes the test procedures and the results of tests on the physical properties of rail, tie and fastener. The properties obtained are the bending rigidity of the tie, bending rigidity of the rail in both the vertical and lateral planes, and the fastener resistance to rotation...

The Kansas Test Track Part I - Analysis of Test Data

This report presents the results of an experimental project to compare the performance of different track support systems. Data obtained during the project are summarized, presented, and analyzed. Based on these data, conclusions are made regarding the performance of the different track support...

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Technical Reports