General

A Review of Rail-Wheel Contact Stress Problems

From its earliest days, railroad technology has been limited by an inadequate understanding of the mechanics of load transfer between wheel and rail. It is the purpose of this paper to indicate the major problems in this area, and to review the progress made to date in the solution thereof....

HQ-2013-01 (Finalized)

Locomotive-Based Top of Rail Friction Control Implementation Results and Issues Phase 1: Atomized Spray/Friction Control Product

This report documents the first phase of a test to determine what effect top of rail (TOR) friction modification has on rail surface friction, lateral curving forces, and train handling. In Phase 1, one type of TOR friction modifier and application system was evaluated, primarily on coal trains...

Estimation of Residual Stresses in Railroad Commuter Car Wheels Following Manufacture

A computer simulation of the manufacturing process of railroad car wheels is described to determine the residual stresses in the wheel following fabrication. Knowledge of, and the ability to predict, these stresses is useful in assessing the ability of wheels to perform safely under expected...

Revised Railroad Tank Car Damage Assessment Guidelines for Pressure Tank Cars

Under Federal Railroad Administration (FRA) Contract No. DTFR 53-93-C-00001, Task Order Number 115, the Transportation Technology Center, Inc. (TTCI), a subsidiary of the Association of American Railroads (AAR), conducted a multi-phase research project focusing on the field assessment of damage to...

Fatigue Behavior of Railcar Wheel Steel at Ambient and Elevated Temperature

This report presents the results of a material property test program undertaken on a Class B railcar wheel steel. This work was performed to obtain relevant fatigue data that may be used in support of a larger effort exploring the applicability of fatigue-based acceptance criteria for passenger...

Passenger Train Grade Crossing Impact Tests: Test Procedures, Instrumentation, and Data

Two full-scale impact tests performed June 4 and June 7, 2002, involved single Budd Company Pioneer-type cab car impacts into a heavy steel coil on a frangible support. For the first test on June 4, a cab car was fitted with a 1990's design front end, and for the second test on June 7, with a state...

Passenger Rail Train to Train Impact Test: Test Procedures, Instrumentation, and Data

A full-scale passenger rail train-to-train impact test was performed on January 31, 2002, at the Transportation Technology Center, Pueblo, Colorado. The actual speed of impact, as measured by the laser speed trap, was 29.9 mph resulting in a large amount of damage to the leading cab-car, which...

Commercial-Off-The-Shelf (COTS) Hardware and Software for Train Control Applications: System Safety Considerations

The objective of this study was to assess the feasibility of using commercial off-the-shelf (COTS) processor-based systems for safety-related railroad applications. From the safety perspective, the fundamental challenges of using COTS products are most pronounced within the product evaluation and...

Evaluation of Railroad Cab Car End Beam Designs

This report presents the results of an experimental study to establish the strength and energy absorption capability of railroad cab car comer structures built to current requirements and for structures modified to carry higher loads and absorb more energy. Current cab car structures...

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General