Technical Reports

Effects of Coupler Height Mismatch on the Structural Integrity of Railroad Tank Car Stub Sills

This project evaluated the safety implications of coupler height mismatches on the integrity of railroad tank car stub sills, through a series of static and impact tests. The test car was a loaded tank car instrumented with strain gages at critical locations. Static tests consisted of squeeze tests...

Potential Means of Cost Reduction in Grade Crossing Motorist-Warning Control Equipment Volume I: Overview, Technology Survey and Relay Alternatives

The results of a recent study of railroad-highway grade crossing warning system technology are presented. Emphasis in the investigation was placed on the determination of the potential for significant reduction in equipment, installation and maintenance costs through improvements sought within...

Innovative Concepts and Technology for Railroad-Highway Grade Crossing Motorist Warning Systems Vol. II: The Generation and Analysis of Alternative Concepts

This report describes the results of a study directed toward the generation, analysis and evaluation of innovative conceptual and technical approaches to train-activated motorist warning systems for use at railroad-highway grade crossings. Particular attention is given to the use of the track as a...

Innovative Concepts and Technology for Railroad-Highway Grade Crossing Motorist Warning Systems, Volume I: Overview and Concept Generation and Analysis

This document includes a general review of innovative conceptual and technical approaches to train-activated motorist warning systems for use at railroad-highway grade crossings, and also contains a specific report describing a study directed toward the generation, analysis and evaluation of...

The Cause of Thermal Fatigue Cracking In Metroliner Wheels

One new wheel and two used wheels (one with a thermal crack in the tread) were examined for mechanical properties, macrostructure, microstructure, and residual stresses. Similar examinations were conducted on three new wheels which were first subjected to various braking cycles designed to...

Economic Analysis of the Use of the Electromagnetic Acoustic Transducer (EMAT) For Wheel Stress Management

Transportation Technology Center, Inc. (TTCI) has analyzed the economics of using Electromagnetic Acoustic Transducer (EMAT) technology to inspect freight car wheels. EMATs are designed to nondestructively determine the residual hoop stresses of a freight car wheel at the rim. Braking...

Train Generated Air Contaminants in the Train Crew's Working Environment

This document contains data on the levels of air contaminants in the train crew's working environment. Measurements were made in locomotive cabs and cabooses of freight trains travelling through long tunnels and over mountainous terrain. In addition, measurements were performed in long-hood...

Damage Assessment of Railroad Tank Cars Involved in Accidents: Phase II Modeling and Validation

The Accident Damage Assessment Guidelines used to make decisions on the safety of damaged pressure tank cars were formulated in the 1970s by the Association of American Railroads (AAR) under the auspices of the Federal Railroad Administration (FRA). Although these Guidelines have served their...

Controlled Tank Car Impact Tests

A series of controlled tank car impact tests were performed by the Association of American Railroads as part of a Federal Railroad Administration Task Order entitled "Hazardous Materials Transportation Safety Research Test Program." The objective of these tests, in which a weighted locomotive was...

Conrail Electronically Controlled Pneumatic Brake Revenue Service Test

This letter report, prepared by the Association of American Railroads (AAR), Transportation Technology Center (TTC), Pueblo, Colorado, covers the final report on the Conrail Electronically Controlled Pneumatic (ECP) Brake Revenue Service Test. The test report written by Conrail is attached. The...

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Technical Reports