General

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...

Improvement of the Effectiveness of Motorist Warnings at Railroad-Highway Grade Crossings

Flashing red incandescent lamps have formed the primary motorist warning device at grade crossings for several decades, in spite of technical constraints that inherently limit the overall effectiveness possible. Tightly focused beans, necessary to obtain high intensity at low power consumption...

Conductive Interference in Rapid Transit Signalling Systems, Volume II: Suggested Test Procedures

Methods for detecting and quantifying the levels of conductive electromagnetic interference produced by solid state rapid transit propulsion equipment and for determining the susceptibility of signaling systems to these emissions are presented. These methods include procedures for taking...

Concept of Operations and System Requirements Specification for a Vehicle Tracking System at the Transportation Technology Center

Transportation Technology Center, Inc. (TTCI), a subsidiary of the Association of American Railroads (AAR), performed a review of currently available Vehicle Tracking System (VTS) technologies and their applicability to operations at the Federal Railroad Administration's Transportation Technology...

Concept of Operations and System Requirements Specification for a Vehicle Tracking System at the Transportation Technology Center

Transportation Technology Center, Inc. (TTCI), a subsidary of the Association of American Railroads (AAR), performed a review of currently available Vehicle Tracking System (VTS) technologies and their applicability to operations at the Federa lRailroad Administraion's Transportation Technology...

« First
‹‹
…
454
455
456
457
458
459
460
461
462
…
››
Last »

USA Banner

General