Technical Reports

Vehicle Track Interaction Truck Hunting

In an effort to better understand the practical aspects of the truck hunting response of two typical freight vehicles, a Federal Railroad Administration (FRA) test program was conducted at the Transportation Test Center (TIC). Axle and carbody accelerations were measured on a conventional design...

Stub Sills on Tank Cars

The results of this study indicate that the head brace repair procedure provides an effective means for redirecting stub sill loads into the tank body, thus reducing stresses at the critical sill-to-reinforcing pad weld sites. Our analysis indicates that the stub sill to tank interface stresses...

Inverter-Controlled ac Induction Motor Propulsion System Volume II: Final Report

An inverter-controlled ac induction motor propulsion system for rail transit cars was designed, developed, and tested to verify projected benefits and applicability of ac over conventional dc cars. Two New York City Transit Authority (NYCTA) R-44 dc subway cars were retrofitted with prototype ac...

Inverter-Controlled ac Induction Motor Propulsion System Volume I: Executive Summary

Evaluation of Locomotive Cab Air Flow Meters for Train Air Brake Leakage Monitoring

Railroad freight train brake systems must be qualified for safe operation by meeting three brake pipe test criteria: (1) a minimum pressure of 60 psig at the rear of the train, (2) a maximum pressure gradient of 15 psi over the length of the train, and (3) a maximum leakage of 5 psi per minute...

Cant Deficiency Test Safety Monitoring Using Accelerometer Measurements

The FRA has performed high cant deficiency curving tests on several passenger trains using instrumented wheels to measure wheel forces for comparison to derailment safety criteria. Data from these tests show that the vehicle overturning safety criterion which prevents wheel lift is the most...

A Comparison of Model and Field Test Dynamic Performance Data for a Two-Axle Freight Car

A microcomputer based simulation has been developed for predicting the safety related dynamic performance of rail cars. The simulation has been implemented specifically for a two-axle rail vehicle. Model data for test scenarios prescribed by the Association of American Railroads' (AAR) Chapter XI...

Rail Garrison - Vehicle Stationary Vibration Tests

The United States Air Force (USAF/BMO) requested support from the Federal Railroad Administration (FRA) to assist in technical issues related to the development of the Peacekeeper Rail Garrison Program. During operation of the Rail Garrison train, the consist will stop at various locations to...

Laboratory Investigation of Roller Bearing Damage Due to Impact

This report presents the results of a two phase testing program to measure the strains in the roller separators (cages) of a bearing during impact loading. The impact loading is similar to the impacts encountered during in-service operations with flat spots on the wheels. The first phase of the...

Equipment Testing and Analysis - Glazing Impact Test: An Evaluation of Two Plastic and Glass Window Systems Subjected to Projectile Impacts

Impact tests were conducted at the Transportation Test Center on two glazing systems installed in railroad locomotives, passenger cars, and cabooses. A 1/4" thick extruded polycarbonate plastic and a 1/4" thick cast acrylic plastic, each installed in combinations with a 1/4" thick sheet of tempered...

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Technical Reports