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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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      <title>BUS AND RAIL ROLLING STOCK, EQUIPMENT IN METROPOLITAN CHICAGO</title>
      <link>https://trid.trb.org/View/7423</link>
      <description><![CDATA[A computer-assisted inventory procedure was developed as a tool in formulating the rolling stock renewal component of the mass transit priority program in metropolitan Chicago. A computer tabulation of each unit was compiled, using standards provided by the individual carriers to estimate the functional economic life of vehicles in the existing transit fleet.  Results of the rolling stock inventory are broken down among bus, suburban rail, and rapid transit modes with reference to fleet size, vehicle manufacturers, and various equipment conditions such as air conditioning. The author notes that annual updates of this report are anticipated.]]></description>
      <pubDate>Sun, 09 Mar 2003 00:00:00 GMT</pubDate>
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      <title>VIBRATIONS OF CURVED SPANS FOR MASS TRANSIT</title>
      <link>https://trid.trb.org/View/154192</link>
      <description><![CDATA[Nondimensional dynamic responses of simple and multiple-supported, horizontally curved beams with moving loads are measured in laboratory-scale experiments.  Effects of system parameters involving span stiffness, arc length, frequency, end support constraints, and various transit load speeds and spacings are investigated.  For critical combinations of certain parameters, adverse coupling of bending and torsional span responses are observed.  For instance, as critical load speeds are approached, measured twist angles and bending strains at midspan approach unboundedness for multiple spans, but are bounded for equivalent simple spans placed end-to-end.  Calculations based on Bernoulli-Euler curved beam theory (with negligible warping rigidity) complement these simple span measurements. Experiments also include multiple spans with up to 90 degree turns, subject to both transit point loads in tandem and sprung vehicles.  Results are applicable to dynamic span designs for mass transit systems.]]></description>
      <pubDate>Thu, 05 Aug 1982 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/154192</guid>
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      <title>COMPARISON OF EXPERIMENTAL AND THEORETICAL REACTION RAIL CURRENTS, RAIL VOLTAGES, AND AIRGAP FIELDS FOR THE LINEAR INDUCTION MOTOR RESEARCH VEHICLE</title>
      <link>https://trid.trb.org/View/57704</link>
      <description><![CDATA[Measurements of reaction rail currents, reaction rail voltages, and airgap magnetic fields in tests of the Linear Induction Motor Research Vehicle (LIMRV) were compared with theoretical calculations from the mesh/matrix theory. It was found that the rail currents and magnetic fields predicted by the theory are within 20 percent of the measured currents and fields at most motor locations in most of the runs, but differ by as much as a factor of two in some cases. The most consistent difference is a higher experimental than theoretical magnetic field near the entrance of the motor, and a lower experimental than theoretical magnetic field near the exit. The observed differences between the theoretical and experimental magnetic fields and currents do not account for the differences of as much as 26 percent between the theoretical and experimental thrusts. (Color illustrations reproduced in black and white)]]></description>
      <pubDate>Sat, 30 Jan 1982 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/57704</guid>
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    <item>
      <title>A PRELIMINARY EVALUATION OF ELECTRICAL PROPULSION BY MEANS OF IRON-CORED SYNCHRONOUSLY OPERATING LINEAR MOTORS</title>
      <link>https://trid.trb.org/View/63189</link>
      <description><![CDATA[The report is a preliminary evaluation of the technical feasibility of using iron-cored, synchronously operating motors to propel ground transportation vehicles in the high cruise speed range. A second consideration is the possibility that the motor might also provide strong attractive and lateral forces. Three motor types, all realizable with passive track rails are investigated: (a) claw-pole synchronous motor, (b) homopolar inductor motor, and (c) heteropolar inductor motor. A rail clearance of 1.5 cm is specified. However, the effect of variations in this and other design parameters is also analyzed. All three types considered compare favorably with an equivalent single-sided induction motor, insofar as weight, efficiency, and power factor are concerned. The calculations are supported by analog simulation experiments.]]></description>
      <pubDate>Sat, 16 Jan 1982 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/63189</guid>
    </item>
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      <title>IMPACT OF BART ON HIGHWAY PLANNING AND POLICY</title>
      <link>https://trid.trb.org/View/79288</link>
      <description><![CDATA[The construction and operation of BART resulted in no dramatic changes in State highway facilities and planning, However, the State of California and BART did enter into policy agreements to develop existing highway rights-of-way for joint transit and highway use.  The policy decision-making process and BART-State interactions were traced through the period of BART planning and construction to assess changes in highway planning and policy that might have resulted from BART.  The policy outcome -- joint use of facilities for transit and highways -- appeared to be a cost effective development strategy in terms of broad public constituencies.  An assessment of this policy outcome also provides some "lessons learned" for other communities considering rapid rail transit development such as the need for an independent third party to make trade-offs during negotiations and the need for clarity and formality in policy agreements.]]></description>
      <pubDate>Mon, 12 Oct 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/79288</guid>
    </item>
    <item>
      <title>ENVIRONMENT PROJECT. PRELIMINARY FINDINGS REGIONAL AIR EMISSIONS</title>
      <link>https://trid.trb.org/View/24188</link>
      <description><![CDATA[This study presents findings relative to changes in the emission of automobile generated pollutants (CO, HC and NOx) resulting from VMT changes associated with the use of BART. The effect of changing VMT on emissions of pollutants is assessed for both the total 9-county Bay Area airshed and for the 3-county BART service area. The findings are related to the Control Strategy Plan for the San Francisco Bay Area.]]></description>
      <pubDate>Wed, 15 Jul 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/24188</guid>
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      <title>TUNNELING COST ANALYSIS</title>
      <link>https://trid.trb.org/View/7093</link>
      <description><![CDATA[The report provides the Office of High Speed Ground Transportation with a review and analysis of tunnel construction costs.  The data for all cost analyses in the report were obtained from historical records of tunnel owners, contractors, and equipment and material manufacturers throughout the United States.  The report proper includes discussions regarding the data gathering process, the methods of analysis employed, and the tunneling cost estimating relationships.  Also, included is a brief review of the cost impact of differences in tunnel design and construction policies.  (Author)]]></description>
      <pubDate>Sat, 24 Nov 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/7093</guid>
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    <item>
      <title>RECOMMENDATIONS FOR NORTHEAST CORRIDOR TRANSPORTATION. MAIN REPORT. VOLUME 2</title>
      <link>https://trid.trb.org/View/7119</link>
      <description><![CDATA[Volume 2 includes discussions of the Northeast Corridor's population growth patterns and the region's transportation system, an evaluation methodology, descriptions of interim and long term alternative systems, and a comparative analysis of the alternatives as to their technological feasibility, economic costs and benefits and environmental impacts for the years 1975 and 1985.]]></description>
      <pubDate>Sat, 24 Nov 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/7119</guid>
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    <item>
      <title>SAN FRANCISCO AIRPORT ACCESS PROJECT-SUMMARY</title>
      <link>https://trid.trb.org/View/8294</link>
      <description><![CDATA[The report summarizes an earlier study of the feasibility of extending the Bay Area Rapid Transit (BART) system to serve San Francisco International Airport.  This summary was prepared to answer several basic questions about the proposed BART extensions: (1) How can such transit help. (2) How soon is it needed.  (3) What will it be like.  (4) How might the cost be shared.  (5) Will it be built.  A proposed route description and various financing alternatives are discussed.]]></description>
      <pubDate>Fri, 09 Mar 1973 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/8294</guid>
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