Technical Reports

Cost Effectivieness of Research and Development Related to Railroad Electrification in the United States

The object of this report is to determine the impact of research and development on railroad electrification in the United States. It is presumed that electrification is economically viable and that a prior commitment has been made to· electrifying the high density mainlines. Research and...

Correlation of Statistical Representations of Track Geometry with Physical Appearance

Railway track has previously been represented as a random process with certain parameters that relate to the quality of the track. This report helps to make these parameters more meaningful by correlating the random process and its parameters with more familiar descriptions of the track. The...

Comparative Analysis of Dynamics of Freight and Passenger Rail Vehicles

During the course of this contract, analytical studies have been conducted on several different rail vehicles typical of North American railroad operations mathematical models, and computer codes for the mechanization of these models have been generated under this contract to provide a predictive...

Chopper Propulsion System for Electric Locomotives

This preliminary report summarizes the work done during Phase I of contract DOT-FR-9027. This program covers the design and retrofit of a Conrail E44 electric locomotive with a chopper drive system. The chopper system was previously developed by the General Electric Company at its Erie facility and...

Brake System Design Optimization- Volume I: A Survey and Assessment

Existing freight car braking systems, components, and subsystems are characterized both physically and functionally, and life-cycle costs are examined. Potential improvements to existing systems previously proposed or available are identified and described in functional and economic terms....

Anti-Derailment Sensor System Phase I Feasibility Study

In the context of items of hardware which have been developed for military use, principal causes of derailments were studied to determine those amenable to anticipation detection or by onboard sensors. Other elements for relaying sensor outputs and taking appropriate action to prevent or...

Anti-Derailment Sensor System

An Analytical and Experimental Determination of Nonlinear Wheel/Rail Geometric Constraints

Wheel/rail geometric constraint relationships, such as the effective conicity and gravitational stiffness, strongly influence the lateral dynamics of railway vehicles. In general, these geometric constraints are nonlinear functions of the wheelset lateral displacement. This report describes the...

Analyses of Rail Vehicle Dynamics in Support of Development of the Wheel Rail Dynamics Research Facility

The development of experimental facilities for rail vehicle testing at the DOT High Speed Ground Test Center is being complemented by analytical studies conducted by Transportation System Center under the UM204 Rail Supporting Technology Program to the Urban Mass Transportation Administrations...

An Experimental Evaluation of Techniques for Measuring the Dynamic Compliance of Railroad Track

This report covers the initial track measurement task of a 3-phase program to design and fabricate equipment for measuring track dynamic characteristics. The objective of this task was to evaluate techniques for measuring the dynamic compliance and to identify general trends in the behavior of the...

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Technical Reports