Technical Reports

Technical Report Passenger Vehicle Braking Study

This report is a summary of currently available brake components and braking systems that might be applicable to 150-mph passenger service. The summary includes an analysis of the braking problem, a description of braking systems now in use and an evaluation of severa1 advanced braking systems. The...

Organization of a Simple Dynamic Model of a Railroad

This investigation was concerned with techniques for determining values of damping and spring constants that would minimize the vibrations transmitted from irregular railroad track to passenger positions. Results developed for a three degree- of-freedom model using a simplified representation of...

On the Stress Analysis of Rails and Ties

The report first reviews the methods presented in the literature for the stress analysis of the railroad track components and the results of a variety of validation tests. It was found that the equation Eiwiv + kw = q yields deflections and bending stresses in the rails of longitudinal-.tie and...

PTC Test Bed Upgrades to Provide ACSES Testing Support Capabilities at Transportation Technology Center

FRA Task Order 314 upgraded the Positive Train Control (PTC) Test Bed at the Transportation Technology Center to support testing of PTC systems, components, and related equipment associated with the Advanced Civil Speed Enforcement System (ACSES) in a revenue service environment. Transportation...

Numerical Determination of Contact Pressures Between Closely Conforming Wheels and Rails

A numerical method is developed for the determination of the contact pressure that arises when two elastic bodies with closely conforming non-Hertzian frictionless surfaces are pressed together. The method is a generalization of that recently developed by the authors for the case of counterformal...

Northeast Corridor Improvement Project- Task 202: Concrete Tie Cost and Performance for Track Structures

As a result of a survey of the Northeast Corridor, it was determined that 1,100 miles of track require upgrading to meet the trip-time goals set forth in the Railroad Revitalization and Regulatory Feform Act of 1976. As a part of the determination of the best way to meet these requirements, two...

Nondestructive Measurement of Longitudinal Rail Stresses (Final Report)

An ultrasonic probe has been designed, evaluated, and shown capable of measuring longitudinal stress changes in railroad rails. The probe utilizes the effect of applied stress on wave velocity (acoustoelastic effect) to determine the stress change. Both laboratory and field evaluation has shown...

Modern Concrete Crosstie Practice in France and Mexico

Considered briefly is the history of concrete crosstie development in France. Failure of some crossties in 1973 led to a determination of the failure modes and a rigorous analysis of the service load limits to be taken into account. New crosstie designs evolved from this investigation. Technical...

Metroliner Truck Test

This report contains the results of a comparison of ride quality data collected on Metroliner Cars 850 and 855. The comparison is made in terms of standard deviations and peak values of the recorded lateral, vertical, and longitudinal acceleration and in terms of the International Standardization...

Metroliner Ride Improvement Program

The objective of this program was to determine methods of improving the ride quality of the Metro liner railcars. Two levels of modifications were considered: first, modifications to the existing hardware and second, replacement of the present trucks. In the conduct of the program road tests,...

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Technical Reports