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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>ANALYSIS OF ELECTRIFIED GROUND TRANSPORTATION NETWORKS</title>
      <link>https://trid.trb.org/View/60533</link>
      <description><![CDATA[The analysis of a transportation network presents two special problems: the positions of its electrical loads are continually changing; and some or all of it may operate at dc while the parent network in which it is imbedded and from which it draws its power, operates at 60 Hz.  When confronted with these problems conventional power system analysis procedures become either inapplicable or inconvenient to use.  This paper presents alternative methods and computer algorithms that are better suited to the analysis of transportation networks.]]></description>
      <pubDate>Tue, 13 Jan 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/60533</guid>
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    <item>
      <title>TREATMENT OF INFLATION IN ENGINEERING ECONOMIC ANALYSIS</title>
      <link>https://trid.trb.org/View/60817</link>
      <description><![CDATA[A method for treating inflation in engineering economic analysis is developed using the revenue requirements approach.  This method treats all phases of the analysis and can be easily implemented within the framework of conventional revenue requirements analysis.  The problems of inconsistent treatment of inflation are discussed and several examples are given.  Two pages of discussion of the paper are appended.]]></description>
      <pubDate>Mon, 30 Jan 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/60817</guid>
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      <title>CASE OF INDUCTIVE CO-ORDINATION</title>
      <link>https://trid.trb.org/View/60818</link>
      <description><![CDATA[The co-ordination of the expansion of both power and communication networks, to avoid the problem of excessive longitudinally induced voltage on communication and signal circuits, is a matter of increasing importance. This paper deals with the design and installation of railway signal and communication cables in a case where elaborate shielding from the influence of a proposed new adjacent power system was required.  A discussion of the paper is appended.]]></description>
      <pubDate>Mon, 30 Jan 1978 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/60818</guid>
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    <item>
      <title>EXPERIMENTAL EVALUATION OF A HIGH SPEED DOUBLE SIDED LINEAR INDUCTION MOTOR</title>
      <link>https://trid.trb.org/View/36917</link>
      <description><![CDATA[The motor is double sided and of sector shape with radial slots.  It has 4 poles, is 3 feet in length and is loaded by reaction with an 80 inch diameter rotating disc facility. Performance testing including efficiency, power factor, thrust, and normal force and moment are reported for operation over a speed range up to 300 MPH.  A breakdown of losses, including end effects, and measurements of air gap flux density over the length of the motor are also reported.  A description of instrumentation, the data acquisition system and the load loop is given.  The results are expected to be used to increase the understanding of LIM behavior and design and to provide a data base for the verification of new designs and new theoretical models.]]></description>
      <pubDate>Wed, 07 Apr 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/36917</guid>
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    <item>
      <title>COMPUTERIZED APPROACH TO SUBSTATION AND SWITCHING RELIABILITY EVALUATION</title>
      <link>https://trid.trb.org/View/34631</link>
      <description><![CDATA[This paper presents a new approach for the evaluation of substation and switching station reliability performance in terms of outage frequencies and durations.  All realistic component failure modes are included in the reliability predictions.  The computer program described in the paper is fairly general.  It performs failure modes and effects analysis and provides a concise and orderly description of the various combination of occurrences within the system that could result in an interruption.  The application of the program is illustrated by considering two practical system examples.  The concepts described are quite general and can be easily extended to the reliability evaluation of other power systems configurations.]]></description>
      <pubDate>Wed, 05 Nov 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/34631</guid>
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    <item>
      <title>INVESTIGATIONS OF WATER EFFECTS ON DEGRADATION OF CROSSLINKED POLYETHYLENE INSULATED CONDUCTORS</title>
      <link>https://trid.trb.org/View/5423</link>
      <description><![CDATA[As a result of these investigations it was observed that under certain conditions the degradation of crosslinked polyethylene (XLP) cable due to moisture was accelerated by a continuously applied ac stress as compared to dc or the absence of voltage.  Further, the course of the involved activity was believed to take place in three stages.  The first was the appearance of tree like channels which were filled with water, second their subsequent growth, and third their ultimate bridge between the inner and outer cable electrodes.  Conventional insulation resistance measurements failed to reveal or explain these stages.]]></description>
      <pubDate>Sat, 27 Oct 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/5423</guid>
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    <item>
      <title>A HIGH INITIAL RESPONSE BRUSHLESS EXCITATION SYSTEM</title>
      <link>https://trid.trb.org/View/3838</link>
      <description><![CDATA[A high initial response excitation system retaining the advantages of the absence of commutators, collectors and brushes while responding with the speed of an electronic exciter has been developed.  Calculated performance of this system has been confirmed by factory tests.  With the exciter loaded, the excitation system achieved 95 percent of ceiling voltage in 0.016 seconds following a 10 percent step change in the voltage regulator sensing signal.  In addition to the high initial response capability, the excitation system also includes supplementary feedback control for improving the small signal dynamic performance characteristic of the exciter.  With the addition of feedback, the effective exciter time constant is reduced by a factor of thirty compared to its value without feedback.  The tests confirm that low time constants and high initial response can readily be attained in an excitation system which includes a brushless exciter with non-controlled rectifiers.]]></description>
      <pubDate>Tue, 10 Apr 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/3838</guid>
    </item>
    <item>
      <title>MEETING TOMORROW'S RAILROAD POWER REQUIREMENTS</title>
      <link>https://trid.trb.org/View/12070</link>
      <description><![CDATA[The railroad electrification is examined from the viewpoints of competitive position, load characteristic, service requirements and facility design.  Summaries of foreign developments are presented.  Potential electrified railway load magnitudes and characteristics are considered.  Service techniques are recommended and possible characteristics for railroad substations, switching, and overhead power delivery facilities are presented.  There are no insurmountable technical problems associated with servicing anticipated railway loads, and the electric locomotive's many benefits make it a strong competitor for moving tomorrow's trains.]]></description>
      <pubDate>Mon, 02 Apr 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/12070</guid>
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    <item>
      <title>BRUSHLESS THYRISTOR EXCITATION SYSTEMS</title>
      <link>https://trid.trb.org/View/12003</link>
      <description><![CDATA[This paper shows how brushless thyristor excitation systems for large synchronous generators are being evolved in the authors' organization, outlines the electrical and mechanical advantages that accrue, and includes some results of a digital computer comparison of such systems with other forms of excitation.]]></description>
      <pubDate>Mon, 19 Mar 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/12003</guid>
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      <title>APPLICATION OF INSTRUMENTATION FOR THE EVALUATION OF POWER SYSTEM DYNAMIC PERFORMANCE</title>
      <link>https://trid.trb.org/View/5422</link>
      <description><![CDATA[The dynamic performance of electric power systems during disturbances is a function of many factors.  The effect of these factors varies with the nature and configuration of the electrical system and is complicated due to the interrelated, and sometimes compounding effect of the automatic control equipment which makes up a system.  The post-event evaluation of a dynamic system condition requires automatic and instantaneous recording of many system quantities which will show initial conditions, the transient period, the dynamic period, and the steady state or final result of all contributing factors.  The instrumentation required to monitor the influence of various system quantities must provide precise records even though separated by great distances and must continue to perform accurately regardless of wide variations in voltage, current or frequency. This report, prepared by the System Instrumentation Task Force of the Dynamic System Performance Working Group, is intended to provide recommendations as to the kind of system instrumentation required which would aid in the carrying out of post-event analyses of dynamic system conditions.  Due to the very large number of items that can be monitored, it will be obviously necessary to restrict such instrumentation to that which provides the most meaningful data.  Provided in this report is a list of suggested instrumentation which may be chosen based on the needs of a particular system.  As such, it is the intent that data recorded in one system may be directly related to to data recorded in another system to provide that information which is required to analyze, (and perhaps ultimately control), the dynamic performance of electric systems.  It should be noted that such instrumentation should be capable of accurately recording the performance of stable, as well as unstable operating modes such that computer studies of these conditions can be made for post analysis purposes. High speed automatic oscillographs are now available in both magnetic and direct recording types to provide quick response, long duration, pre-fault (or initiation) recording.  Such devices, which are widely accepted for analysis of protective relay operation and, with certain precautionary provisions, are well suited for monitoring system quantities for the purpose of post analysis of system dynamic performance.  Appropriately initiated, these devices can be keyed (on a realtime basis) to high speed, sequential, event recorders, as well as to slower chart type instruments, to monitor the operation of a large number of devices, if desired.  Therefore, equipment to be discussed in the recommendations are, for the most part, available commercially and have given a high degree of reliable operation.]]></description>
      <pubDate>Fri, 27 Oct 1972 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/5422</guid>
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