Technical Reports

Railroad Tank Car Relief Valve Requirements for Liquid PIH Lading

Analyses were performed for the Federal Railroad Administration (FRA) by Transportation Technology Center, Inc., a subsidiary of the Association of American Railroads, to determine if the changes made to Chapter 49 of the Code of Federal Regulations under docket HM-181 for the selection pressure...

Locomotive Crashworthiness Impact Test No. 3: Test Procedures, Instrumentation, and Data

A full-scale impact test of a locomotive crashing into a highway trucking rig (tractor and trailer) loaded with two steel coils was conducted on a grade crossing at the FRA’s Transportation Technology Center (TTC) on December 18, 2002. This was the third of a series of locomotive crashworthiness...

Locomotive Crashworthiness Impact Test No. 2: Test Procedures, Instrumentation, and Data

A full-scale locomotive impact test was performed September 10, 2002. The test involved a SD-45 locomotive, modified to meet AAR Specification S-580, and three trailing loaded hopper cars impacting a stationary log truck at a grade crossing at 50.4 mph. The locomotive broke through the logs and...

Attentuation of Dynamic Response of Special Track Work Foundations Subjected to Impact Loading

This report deals with damage to special track work due to high impact loads and the beneficial effect of increasing damping in these foundations. Additional damping attenuates the high magnitude and high frequency of impact generated transient vehicle- track vibrations. This report covers the...

Locomotive Crashworthiness Impact Test No. 1: Test Procedures, Instrumentation and Data

A full-scale locomotive impact test was performed August 1, 2002. The test involved a SD-45 locomotive, modified to meet AAR Specification S-580, and three trailing loaded hopper cars impacting a stationary consist of 35 loaded hopper cars at 32 mph. There was a large amount of damage to the pilot...

Improved Roller Bearing Wayside Detection Research Phase III: System Evaluation Test

In July 1999, Transportation Technology Center, Inc. (TTCI), a subsidiary of the Association of American Railroads (AAR), conducted Phase III of the Federal Railroad Administration's (FRA) Improved Freight Car Roller Bearing Inspection Program (Task Order 122). Phase III, conducted at the...

The Comparative Wear Performance of Premium and Bainitic Rail Steels under Heavy Axle Loads

The Transportation Technology Center, Inc. (TTCI), a subsidiary of the Association of American Railroads has conducted wear tests on a range of rail steels in a 5-degree curve at the Federal Railroad Administration's Transportation Technology Center (TTC). The tests have included six premium rail...

Improved Roller Bearing Wayside Detection Research: Phase III System Evaluation Test

TTCI conducted a series of simulated revenue service tests with a train of 8 cars containing wheel sets with specific roller bearing defects and wheel sets with good bearings. The purpose of the test was the evaluation of improved wayside acoustic bearing detection systems. The tests were conducted...

Economics of Heavy Axle Loads: Predicted and Actual Benefits of HAL Operations

Over the past 15 years, Transportation Technology Center, Inc. (formerly Research and Test Department of the Association of American Railroads) has devoted a great deal of research to technical and economic issues related to increasing axle loads tinder a program jointly funded by the Association...

Crosstie and Fastener Tests at FAST: 1988-1999

The Heavy Axle Load (HAL) implementation program began in 1988 with the objective of developing economically optimal and safe axle loads for North American railroads. This research is currently being conducted by the Transportation Technology Center, Inc. (TTC), a subsidiary of the Association of...

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Technical Reports