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Design of Tunnel Liners and Support Systems

Contents: Introduction; Fundamentals of tunnel support design; Existing theories, design methods, and practices; Tunnel support systems in soil and soft rocks; Tunnel support systems in rock--Factors influencing behavior; Tunnel support systems in rock--Design procedures; Potential developments of...

Analysis of Optimum and Preview Control of Active Vehicle Suspensions

The analysis leading to the optimum transfer function for an active suspension excited by a random guideway input is briefly reviewed and a design chart is presented. A parameter sensitivity study of the stability is performed and shows excellent system stability. The wheel-guideway contact problem...

The Importance of Effective On-Track Safety Briefings

Following the implementation of the Roadway Worker Protection (RWP) Rule in 1997, there have been a total of 42 fatal RWP accidents, in which 44 roadway workers have perished, as of December 31, 2011. The FAMES Committee was able to obtain data to analyze 39 fatal RWP accidents, which accounted...

Positive Train Control Desense Mitigation Test: Research Phase 1

Final report for Positive Train Control (PTC) Desense Mitigation Test Research project includes description of Northeast Corridor (NEC) PTC deployments, PTC radio desense scenarios, PTC radio desense mitigation approaches, PTC radio desense mitigation trade study, and recommendations. The trade...

Control of Alcohol and Drug Use: Coverage of Maintenance of Way (MOW)

Disclaimer:

The version of the final rule being posted to FRA’s website is not intended to constitute the official version of the final rule.  The official version of the final rule will be the version published in the Federal Register in the near future and may appear slightly...

Probability of Detection Evaluation Results for Railroad Tank Cars

The Transportation Technology Center, Inc. (TTCI) used the approach developed for the National Aeronautics and Space Association to determine the probability of detection (POD) for various nondestructive test (NDT) methods used during inspection of railroad tank cars. The Federal Railroad...