Technical Reports

Results of Laboratory Quasi-Static Jacking Tests on Three Vehicles

Laboratory quasi-static jacking tests were performed on three vehicles at the Transportation Technology Center, Pueblo, Colorado. Results indicate vehicle wheel unloading that occurred during the tests varied with cross level difference, car body torsional stiffness, truck spacing, and vehicle...

Distributions of Dynamic Wheel/Rails Under Heavy Axle Loads

Under the Heavy Axle Load (HAL) program funded by the Association of American Railroads (AAR) and the Federal Railroad Administration (FRA), a test activity was initiated in 1997 to study the relationships between dynamic vehicle responses and track geometry conditions. As a first step, analyses...

Improved Roller Bearing Wayside Detection Research - Phase I Laboratory Test Report

A series of tests were performed at the Bearing Test Facility at the Transportation Technology Center in Pueblo, Colorado, to gather acoustic and acceleration emissions for a number of roller bearing defect types designated by the rail industry as a priority. This database will be used to develop...

Effect of Track Twist on Vehicle Dynamic Performance: Final Report

Results of tests conducted at the Transportation Technology Center (TTC), Pueblo, Colorado, indicate that vehicle response to track twist varies significantly with car type. Critical response variables include car body torsional stiffness, truck spacing, track alignment (tangent or curve), track...

Conventional Passenger Rail Vehicle Safety, Volume I: Summary of Safe Performance Limits

This report presents a methodology based on computer simulation that assesses the safe dynamic performance limits of commuter passenger vehicles. The methodology consists of determining the critical design parameters and characteristic properties of both the vehicle and the track, establishing the...

Considerations for the Development of Alloys Suitable for Use in In-Line Hardening of Rails, Wheels, and Tank Car Plate having Lower Bainite Microstructures

In-line hardening of rails to produce a very fine pearlitic microstructure has become a commercial reality. A question that this report seeks to answer is whether or not it is possible to find an alloy composition that will permit the development of lower bainite microstructures by in-line...

Safety of High Speed Ground Transportation Systems: Technical Descriptions of Advanced Braking Concepts for High Speed Ground Transportation

The objective of this study is to develop qualitative and quantitative information on the various braking strategies used in high-speed ground transportation systems in support of the Federal Railroad Administration (FRA). The approach employed in this study is composed of two steps: first, build a...

Investigation of Lateral Track Strength and Track Panel Shift Using AAR's Track Loading Vehicle

The Association of American Railroads (AAR) is conducting extensive lateral track strength (track panel shift) tests using the AAR’s Track Loading Vehicle (TLV). The entire test program consists of three phases: (1) demonstration tests, (2) fundamental tests, and (3) off-site tests and is a joint...

FAST Heavy Axle Load Ballast Test Results

A ballast experiment was performed at the Federal Railroad Administration’s Transportation Technology Center, Facility for Accelerated Service Testing (FAST), Pueblo, Colorado, as part of the original series of tests designed to determine track performance under 39-ton axle loads. Four ballast...

Crashworthiness of Passenger Trains: Safety of High-Speed Ground Transportation Systems

Studies were conducted evaluating the effectiveness of alternative strategies for providing crashworthiness of the vehicle structures and on the effectiveness of alternative strategies for protecting occupants in train collisions, including friendly interior arrangements and occupant restraints....

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Technical Reports