General

Thermal Insulation Systems Study for the Chlorine Tank Car

A number of therma1 tests were performed on three insulation systems. The purpose was to ascertain if an insulation system consisting of existing materials could prevent the temperature of the shell of a chlorine tank car from exceeding 251°C (483 °F) while the tank car is exposed to...

Determination of Track Lateral Resistance from Lateral Pull Tests

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

An Experimental Investigation of the Discharge of a Flashing Liquid from a Finite Reservoir: A Fundamental Study of the Two-Phase Flow Phenomena Occurring During Venting from Rail Tank Cars

The design of pressure relief valves for railroad tank cars containing pressurized liquid commodities is dependent on knowledge of venting rates during accidents. In turn, development of an appropriate theoretical model requires knowledge of many properties which affect the venting rates of...

Small Scale Impact Simulation Tests

In derailments and switchyard operations, tank cars frequently experience impacts that result in tank car head puncture. From a cost effective viewpoint, it is not practical to conduct many full-scale testing to verify that a particular tank car design will perform satisfactorily in all possible...

Nondestructive Measurement of Longitudinal Rail Stresses (Interim Report)

A study of the effect of applied stress on the wave velocity (acoustoelasticity) of railroad rail steel has shown that a potentially useful technique exists for the nondestructive measurement of longitudinal stresses. The detection of extreme stress levels would contribute toward increased rail...

“The State of Positive Train Control Implementation in the United States”

ORAL STATEMENT OF SARAH FEINBERG ACTING ADMINISTRATOR, FEDERAL RAILROAD ADMINISTRATION U.S. DEPARTMENT OF TRANSPORTATION BEFORE THE COMMITTEE ON TRANSPORTATION AND INFRASTRUCTURE, SUBCOMMITTEE ON RAILROADS, PIPELINES, AND HAZARDOUS MATERIALS U.S. HOUSE OF REPRESENTATIVES “The State of...

Influence of Vehicle Induced Loads on the Lateral Stability of CWR Track

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

Ballast and Subgrade Requirements Study: Railroad Track Substructure – Design and Performance Evaluation Practices

Earth Materials- i.e., soil and rock- form the substructure (ballast, subballast, and subgrade) of all railroad track. In this report, the most suitable technology and design criteria as related to design of the substructure are identified based on a review of current track substructure design...

Ballast and Subgrade Requirements Study: Railroad Track Substructure – Materials Evaluation and Stabilization Practices

Earth materials--i.e., soil and rock--form the substructure of all railroad track. In this report, the functions and performance characteristics of each of the substructure elements (i.e., ballast, subballast, and subgrade), and the material properties that influence the substructure performance...

Analysis of Thermal Buckling Tests on U.S. Railroads

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

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General