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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,...

Methods for Joining of Rails: Survey Report

The performance of track structures depends greatly on the integrity of the connections between rail sections. Because the majority of service and detected rail failures occur at joints, particularly conventional bolted joints, this survey was conducted to review existing practices, examine...

Methodology for Evaluation the Cost and Benefit of Advanced Braking and Coupling Systems

This report presents a quantitative methodology for evaluating the costs and benefits of advanced railroad braking and coupling systems. Starting with a specification of the performance characteristics of candidate systems, the methodology employs four major elements to enable the user to compute...

Measurement of Friction Snubber Forces in Freight Car Trucks

The report describes the design and construction of a set of transducers intended to measure the normal forces (column loads) and friction forces applied by the four friction shoes to the wear plates of a standard, three-piece freight car truck. Two 70-ton trucks, an ASF Ride Control and a Barber S...

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General