Technical Reports

Safety of High Speed Ground Transportation Systems: Analytical Methodology for Safety Validation of Computer Controlled Subsystems. Volume II: Development of a Safety Validation Methodologies

This report describes the development of methodology designed to assure that a sufficiently high level of safety is achieved and maintained in computer-based systems which perform safety critical functions in high-speed rail or magnetic levitation transportation systems. This report consists of two...

Safety of High Speed Ground Transportation Systems: Analytical Methodology for Safety Validation of Computer Controlled Subsystems. Volume 1. State-Of-The-Art and Assessment of Safety Verification/Validation Methodologies

This report describes the development of a methodology designed to assure that a sufficiently high level of safety is achieved and maintained in computer-based systems which perform safety critical functions in high-speed rail or magnetic levitation transportation systems. This report consists of...

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

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 apporach employed in this study is composed of two steps: first, build a...

Locomotive Crashworthiness Research: Executive Summary

Four reports on a study to evaluate whether various crashworthiness features, as defined in Public Law 102-365, can provide practical benefit to the occupants of freight locomotives are summarized. In particular, the benefit was assessed relative to the current industry standard, S-580. The work...

Trial Low Track Modulus Tests at FAST

A study to investigate the influence of low track modulus on track performance under traffic was conducted by the Association of American Railroads, Transportation Test Center, Pueblo, Colorado. A 100-foot trial section of track was constructed to control track modulus. The existing stiff natural...

High Speed Passenger Trains in Freight Railroad Corridors: Operations and Safety Considerations

This report presents the results of a study into some operations and technical issues likely to be encountered when planning for high-speed rail passenger service on corridors that presently carry freight or commuter traffic. The study starts with a review of corridors designated under Section 1010...

The Development and Application of Rail Defect Fracture Models to Assess Remedial Actions

The fracture mechanics models were refined for two types of rail defects - the bolt hole crack and the vertical split head. Beam-type finite element analysis was conducted to determine the effects of joint bar looseness, rail height mismatch and train speed on the static and dynamic components...

Safety of High Speed Guided Ground Transportation Systems Broadband Magnetic Fields: Their Possible Role in EMF-Associated Bioeffects

This report reviews electric and magnetic field (EMF) exposures from electrical transportation systems, including electrically powered rail and magnetic levitation (maglev). Material also covered includes research concerning biological effects of EMF exposure, with special emphasis on broad...

Stress Reconstruction Analysis of Wheel Saw Cut Tests and Evaluation of Reconstruction Procedure

This report is the fourth in a series of engineering studies on railroad vehicle wheel performance. The results of saw cut tests performed on one new and one used wheel designed for a fleet of multiple unit (MU) power cars are summarized and analyzed. Reconstructed residual stresses are computed...

Magnetic and Electric Field Testing of the Amtrak Northeast Corridor, and New Jersey Transit/ North Jersey Coast Line Rail Systems, Volume 1: Analysis

The safety of magnetically levitated (maglev) and high speed rail (HSR) trains proposed for application in the United States is the responsibility of the Federal Railroad Administration (FRA). The characterization of electric and magnetic fields (EMF) produced by both steady (dc) and alternating...

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Technical Reports