Technical Reports

Controlled Tank Car Impact Tests

A series of controlled tank car impact tests were performed by the Association of American Railroads as part of a Federal Railroad Administration Task Order entitled “Hazardous Materials Transportation Safety Research Test Program”. The objective of these tests, in which a weighted locomotive was...

Hazardous Materials Transportation in Tank Cars: Analysis of Risks- Part I

This report covers the development of a methodology to evaluate the potential national public risk arising from the transportation of hazardous materials in tank cars on US railroads. The analysis is intended to assess the relative changes in the overall risk when (structural) safety devices are...

FRA Tank Car Manufacturing/Repair/Retest Facility Evaluation Form

An inspection form is described to aid Federal Railroad Administration (FRA) inspectors when inspecting tank car manufacturing and repair facilities, when examining newly constructed tank cars, or when inspecting tank cars which have been repaired or retested. Instructions and background...

Temperatures, Pressures, and Liquid Levels of Tank Cars Engulfed in Fires : Volume 1, Results of Parametric Analyses

An analytical procedure has been developed for calculating the effects of fire on a railroad tank car containing a hazardous material. The procedure was developed so that the consequences of using different conductances for the thermal insulation on the tank and different flow capacities of the...

A Hybrid Active/Passive Exhaust Noise Control (APECS) for Locomotives

This report documents the analysis and development of an Active/Passive Exhaust Noise Control System (APECS) for railroad passenger locomotives that could provide at least 10 dBA noise reduction. Based on preliminary analyses and tests on actual locomotives in 1995 and 1996, a combination active...

Investigation of the Effects of Tie Pad Stiffness on the Impact Loading of Concrete Ties in the Northeast Corridor

This investigation was conducated in response to the discovery in June 1980, that rail seat bending cracks had developed in many concrete ties which had been in service on the Amtrak Northeast Corridor track for periods of a few months. The study was initiated by the Federal Railroad Administration...

Experimental Study of Residual Stresses in Rail by Moire Interferometry

The residual stresses in rails produced by rolling cycles are studied experimentally by moire interferometry. The dissection technique is adopted for this investigation. The basic principle of the dissection technique is that the residual stress is released elastically by creating free boundaries...

Gage Restraint Measurement System Comparison Tests: Railbound and Hi-Rail Vehicles

Compartive tests were conducted to evaluate the gage restraint measurements system (GRMS) testing capabilities of a railbound GRMS vehicle, Federal Railroad Administraion's (FRA's) T-6, and a hi-rail vehicle, Holland Company's TrackStar GRMS system. The test objectives were to compare the...

Experimental Investigations of Dynamic Buckling of CWR Tracks

Thermal Buclking of railroad tracks in the lateral plane is an important problem in the design and maintenance of continous welded rail (CWR) tracks. The severity of the problem is mainfested through the large number of derailments which are attributable to track buckling, indicating a need for...

Determination of Residual Stresses in Rails

A destructive sectioning technique for measuring the complete three-dimensional residual stresses in a rail cross section was developed. The technique was applied to four tangent rail specimens: two 136-pound specimens were taken from FAST (Facility for Accelerated Service Testing), Pueblo,...

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Technical Reports