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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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    <item>
      <title>CAPACITY: MODEL FOR ESTIMATING RAIL YARD CAPACITY AND RESOURCE REQUIREMENTS</title>
      <link>https://trid.trb.org/View/173170</link>
      <description><![CDATA[The estimation of a rail yard's capacity and resource requirements is a key task in the overall yard design process.  A model for estimating yard capacity and resource requirements, CAPACITY, is presented.  It is capable of working from planning-level or actual observed traffic data.  This model is a microscopic table-driven simulation.  It requires a minimum of computer resources and is intended to be used by the yard designer in an iterative and interactive manner.  The model provides the designer with an extensive series of output reports that detail the yard's performance, capacity, and resource requirements.  The application of the model in a real-world yard rehabilitation study of the Boston and Maine Railroad's East Deerfield Yard is discussed. By using the CAPACITY model, this study concluded that the proposed design for the East Deerfield Yard could handle the contemplated traffic load.]]></description>
      <pubDate>Wed, 28 Oct 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/173170</guid>
    </item>
    <item>
      <title>RAILROAD CLASSIFICATION YARD TECHNOLOGY MANUAL--VOLUME I: YARD DESIGN METHODS</title>
      <link>https://trid.trb.org/View/169459</link>
      <description><![CDATA[This volume (Volume I) documents the procedures and methods associated with the design of railroad classification yards. Subjects include: site location, economic analysis, yard capacity analysis, design of flat yards, overall configuration of hump yards, hump yard track and switch layout, hump profile design, and hump trim-end design. Volume II is concerned with the design and specification of the yard computer systems, i.e., yard inventory and process control computer systems.]]></description>
      <pubDate>Sat, 15 Aug 1981 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/169459</guid>
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      <title>RAILROAD CLASSIFICATION YARD TECHNOLOGY. DESIGN METHODOLOGY STUDY</title>
      <link>https://trid.trb.org/View/150984</link>
      <description><![CDATA[The report documents the first phase of a three-phase effort to develop a railroad classification yard design methodology. Topics discussed include: site selection, hump grade profile design, sub-yard capacity requirements, trim-end conflict resolution, yard geometry and layout, yard hardware systems, and yard computer systems.]]></description>
      <pubDate>Tue, 16 Sep 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/150984</guid>
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    <item>
      <title>CLASSIFICATION YARD CAPACITY AND HUMP YARD SIMULATION MODEL DOCUMENTATION</title>
      <link>https://trid.trb.org/View/143651</link>
      <description><![CDATA[The Capacy model was designed to emulate manual capacity calculations for railroad classification yards. The output from this simulation model can help in planning railroad classification yards. By running this program with different traffic level inputs and analyzing the simulation output, one can estimate the type and size of classification yard needed. The Profile simulation program was written to help in designing a hump yard. Optimum hump yard grades and retarder placements can be extracted from the outputs of this simulation program. The movement of railroad cars over different hump yard profiles can be simulated, so that the consequences of different hump yard designs can be discovered before implementation. This simulation program is a preliminary version and may be changed subsequent to utilization. Contacting the Transportation Systems Center regarding the current status of the program is recommended.]]></description>
      <pubDate>Tue, 15 Jan 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/143651</guid>
    </item>
    <item>
      <title>CLASSIFICATION YARD CAPACITY AND HUMP YARD SIMULATION MODEL</title>
      <link>https://trid.trb.org/View/145467</link>
      <description><![CDATA[The CAPACY model was designed to emulate manual capacity calculations for railroad classification yards. The output from this simulation model can help in planning railroad classification yards. By running this program with different traffic level inputs and analyzing the simulation output, one can estimate the type ad size of classification yard need. The profile simulation program was written to help in designing a hump yard. Optimum hump yard grades and retarder placements can be extracted from the outputs of this simulation program. The movement of railroad cars over different hump yard designs can be discovered before implementation. This simulation program is a preliminary version and may be changed subsequent to utilization. Contacting the Transportation System Center regarding the current status of the program is recommended...Software Description: The program is written in the Fortran programming Language for implementation on a DEC System-10 computer using the TOPS-10 operating system. 80K bytes of core storage are required to operate the model.]]></description>
      <pubDate>Tue, 15 Jan 1980 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/145467</guid>
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    <item>
      <title>THE DIMENSIONS OF SORTING SIDINGS IN FREIGHT MARSHALLING YARDS</title>
      <link>https://trid.trb.org/View/53723</link>
      <description><![CDATA[Expenditure for laying sorting sidings and for their maintenance together with costs for train formation represent the largest portion of overall costs of carload traffic.  Through the science of railway operations, a number of methods have been developed for determining the capacity of sorting sidings in marshalling yards.  The author describes a stochastic method separately from marshalling yard timetables which indicates the maximum capacity of sorting sidings.]]></description>
      <pubDate>Mon, 15 Aug 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/53723</guid>
    </item>
    <item>
      <title>RAILROAD CLASSIFICATION YARD TECHNOLOGY. A SURVEY AND ASSESSMENT</title>
      <link>https://trid.trb.org/View/47853</link>
      <description><![CDATA[This report documents a survey and assessment of the current state of the art in rail freight-car classification yard technology. The major objective was the identification of research and development necessary for technological improvements in railroad classification yards. This involved a projection of future classification yard needs and a comparison of these requirements of existing technology. Separate tasks included a description of the hardware, costs, performance characteristics, and operational practices of existing yards; formulation of general yard-network interaction concepts; collection of in-depth background information concerning the yard population in the United States (categorized by type, technology, and function); estimation of the demands likely to be placed on the nation's network of freight-car terminals during the foreseeable future; and an assessment and prioritization of those areas of terminal operations that warrant further research or development.]]></description>
      <pubDate>Wed, 27 Apr 1977 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/47853</guid>
    </item>
    <item>
      <title>THE POTENTIAL CAPACITY OF VARIOUS TYPES OF AUTOMATIC HUMPING SYSTEMS</title>
      <link>https://trid.trb.org/View/13032</link>
      <description><![CDATA[The above article contains a summary of ORE report D.74/RP.4.  It shows:  1) The formulae covering the resistance of wagons to forward running to be taken into consideration for calculations of track gradients and the speed of wagons.  2) The formulae covering the capacity of a marshalling yard in relation to the splitting up speed.  3) It also contains a description fo 4 splitting up installations which have been listed: by the CFF; by the DB in Duisburg-Wedan; by the SNCF at Vaires; by the BR at Tinsley.  A critical examination is made of their operation, and a table is provided showing, in the case of each installation, the hump gradients, the splitting up speeds, and the numbers of wagons marshalled every 24 hours.]]></description>
      <pubDate>Sun, 14 Nov 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/13032</guid>
    </item>
    <item>
      <title>RAILROAD FREIGHT CAR CLASSIFICATION YARDS: INSTALLATIONS 1924-1976</title>
      <link>https://trid.trb.org/View/44349</link>
      <description><![CDATA[Mechanized classification yards have undergone many design and operating changes since their introduction in 1924. This report is a tabulation of all railroad freight classification yard installations in the U.S. and Canada. Information shows year placed in service, railroad, yard name and location, major equipment supplier, number of tracks and type of control.  Also included is hardware configuration, use of computers, peripheral equipment and other data of interest.]]></description>
      <pubDate>Wed, 03 Nov 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/44349</guid>
    </item>
    <item>
      <title>CAPACITY PROBLEMS AT THE SORTING SIDINGS OF A MARSHALLING YARD</title>
      <link>https://trid.trb.org/View/46378</link>
      <description><![CDATA[For calculation of the length of the sorting sidings in a marshalling yard, the necessary correlations are developed. Among them are the effects of stochasticity, or the mode in which cars are collected and the number of cars involved. Capacity is ultimately governed by the additional time which trains must spend in the classification tracks after the sorting is completed.  Three closely associated problems are discussed: Capacity of tracks, capacity of the entire yard and determination of the times at which trains are assembled in the department yard.]]></description>
      <pubDate>Tue, 03 Aug 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/46378</guid>
    </item>
    <item>
      <title>WORKLOAD INFORMATION SYSTEM FOR PLANNING (WISP)</title>
      <link>https://trid.trb.org/View/44595</link>
      <description><![CDATA[The computer program creates small individual user-oriented information files which can be used for such purposes as planning the make-up and frequency of trains, determining the amount of capacity expansion required at overcrowded yards, deciding what traffic could be eliminated from congested line segments and determing the effect heavier cars are having on the life of bridges and rail.  The main operations of WISP are the merging of data for each move from one past year and two forecast years into one large file, the addition of the train type and standard route to the description of each move and the grouping of commodity types, car types and station numbers to the level of detail required by the user.]]></description>
      <pubDate>Sat, 05 Jun 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/44595</guid>
    </item>
    <item>
      <title>STANDARDIZATION OF WORKING PROCEDURES AND OF MEANS FOR INCREASING THE CAPACITY OF MARSHALLING YARDS</title>
      <link>https://trid.trb.org/View/14927</link>
      <description><![CDATA[The application of modern organization systems and techniques should enable the Railways to increase the quality of their service and to exploit to the full all the resources at their disposal.  Marshalling yards play an essential part in organizing the transport of goods traffic; for this reason, it is necessary to increase their capacity by accelerating operations in marshalling yards and by reducing costs.  The purpose of this leaflet is to recommend certain measures in the organizational fields, and methods of operation designed to achieve this end.]]></description>
      <pubDate>Wed, 05 Nov 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/14927</guid>
    </item>
    <item>
      <title>USRA YARD CLASSIFICATION PLANNING PROJECT. SUMMARY. MAXIMUM THROUGHPUT AND ASSOCIATED EXPENDITURES IN HIGH PRIORITY YARDS</title>
      <link>https://trid.trb.org/View/23932</link>
      <description><![CDATA[The study analyzed selected yard operations, including handling of inbound/outbound trains, interchange and transfers, line planning procedures and operating and managerial controls. The contractor proposed the maximum throughout of road cars for each of several terminals and yards premised upon 'reasonable' upgrade and expansion of existing facilities.]]></description>
      <pubDate>Thu, 26 Jun 1975 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/23932</guid>
    </item>
    <item>
      <title>THE OPTIMUM NUMBER OF SIDINGS IN A MARSHALLING YARD</title>
      <link>https://trid.trb.org/View/24758</link>
      <description><![CDATA[The waiting time conditions in a marshalling yard(consisting of a group of arrival sidings and a hump) have been investigated with the aid of methods developed earlier. It was found that, as the waiting times in the arrival sidings and their approach tend to compensate each other, there exists a minimum delay if the delay is regarded as the sum of the two waiting times. This also determines an optimum number of arrival sidings. Moreover, this method can be used for determining the maximum throughout capacity of marshalling yard. The application of the proposed method is facilitated by a number of diagrams.]]></description>
      <pubDate>Fri, 13 Dec 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/24758</guid>
    </item>
    <item>
      <title>OPTIMIZATION OF PROSPECTIVE PLANNING OF CLASSIFICATION YARD DEVELOPMENT</title>
      <link>https://trid.trb.org/View/27001</link>
      <description><![CDATA[The paper deals with the solution of problems involved in determining the technical characteristics of classification yard operation relating the volume of car traffic to the car detention, and also to the allowable level of traffic to be handled by a yard, and in selecting measures for improving the technical equipment of a yard for the prospective conditions of its operation.  The problems are solved with the use of the method of mathematical modeling of production processes on an electronic computer.]]></description>
      <pubDate>Fri, 13 Dec 1974 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/27001</guid>
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