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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>
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    <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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      <title>FILTRATION OF THE COMBUSTION AIR AND THE COOLING AIR OF INTERNAL COMBUSTION ENGINES, AND COOLING AIR FOR ELECTRIC MACHINERY ON LOCOMOTIVES. PART A: AIR FILTRATION. REPORT OF ENQUIRY</title>
      <link>https://trid.trb.org/View/15177</link>
      <description><![CDATA[The present report gives an account of the research undertaken by several Member-Administrations of ORE on the two following subjects:  Determination of the dust content of air absorbed by rolling stock, and filtration of the combustion air of internal combustion engines, and cooling air for electric machinery on Diesel and electric locomotives and air conditioning on vehicles.  As far as the former field of studies is concerned, the studies undertaken have not been very numerous and the results of what systematic measurements were made are not yet definitely known.  As regards the latter field, some Member-Administrations have however undertaken comparative tests on filters; they have also defined the  conditions for the cleaning of the filters used by them on their rolling stock. Some of them have standardized the dimensions of some types of filters and a few Administrations have compiled a technical specification for the supply of filters. The report concludes that additional studies would be useful in order to supply solutions of general application as regards the problem of air filtration.]]></description>
      <pubDate>Fri, 08 Jul 1994 00:00:00 GMT</pubDate>
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      <title>FILTRATION OF COMBUSTION AIR AND COOLING AIR OF INTERNAL COMBUSTION ENGINES AND COOLING AIR FOR ELECTRIC MACHINERY ON MOTIVE POWER UNITS. PART B: INFILTRATION OF SNOW. SUPPLEMENTARY ENQUIRY (WINTER 1962/63)</title>
      <link>https://trid.trb.org/View/15178</link>
      <description><![CDATA[In the conclusions of Report B 67/B "Infiltration of snow", June 1963 edition, the Rapporteur proposed that the experience gained by the Administrations in the severe winter of 1962/1963 (heavy snowfall at extremely low temperatures) should be collected by means of a supplementary enquiry.  The present report contains the results of this enquiry.  As to the behaviour of the air-gratings and air-filters relative to the infiltration of snow, the data compiled in the first report were confirmed. The extreme weather conditions in the winter of 1962/1963 led, however, to break-downs of motive power units, which, for the major part, require measures in addition to the mere installation of air-gratings and filters.  Technical and operational improvements introduced by the Administrations are described in the report.  The proposal of ORE for a further study of the question "winter resistant motive power units" has been incorporated in the Chapter "Conclusions".]]></description>
      <pubDate>Fri, 08 Jul 1994 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/15178</guid>
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    <item>
      <title>FILTRATION OF COMBUSTION AND COOLING AIR ON LOCOMOTIVES. RESEARCH MADE IN 1964 ON THE CHARACTERISTICS OF THE SORTS OF DUST TO BE FILTERED ON MOTIVE POWER UNITS (DETERMINATION OF ONE OR MORE TYPES OF DUST)</title>
      <link>https://trid.trb.org/View/15179</link>
      <description><![CDATA[After the presentation in June 1963 to the Control Committee of ORE of a Report of Enquiry concerning the filtration of air on rolling stock, the Specialist Committee B 67 was set up in order to compile a technical specification for the supply of air filters and for this purpose it also established the indicated Programme of Work.  During its studies made in 1962, the SNCF had already obtained provisional results (under special and local conditions) concerning the dust floating in the air sucked-in.  At the proposal of the Specialist Committee B 67, the SNCF continued its research from 1964 in order to determine the properties of the dust suitable to serve as a basis for the tests on air filters in the laboratory.  The present report indicates the conditions under which the research was made in 1964; it also contains a description of the sampling methods and the analyses applied, the procedures adopted and the instruments used.  It gives an account of the difficulties encountered, the results obtained and it explains the differences between those obtained in 1962 and 1964. The method for drawing samples could be improved.  It can, however, already now be stated that under the conditions under which the tests in the track were made on the system of the SNCF the dust content of the air take-in is very small and the majority of the dust particles have dimensions smaller than 10 microns.  On the strength of the results obtained, a typical sort of dust has been chosen for the tests in the laboratory.]]></description>
      <pubDate>Wed, 06 Oct 1976 00:00:00 GMT</pubDate>
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      <title>FILTRATION OF THE COMBUSTION AIR AND THE COOLING AIR OF MOTIVE POWER UNITS. TESTS ON FILTERS IN THE LABORATORY</title>
      <link>https://trid.trb.org/View/15180</link>
      <description><![CDATA[This report deals with the operating tests on air filters carried out on behalf of the B 67 Specialist Committee. Their purpose was to ascertain whether, according to the quantity of dust retained, the filters used in service showed similar pressure deops to the filters tested in laboratory with the type of dust defined in report No. 1 and using the concentrations selected for the tests described in report No. 2. Results show severe scatter of of the points measured, but with a few exceptions, the points measured were within the range of pressure-drop surves ascertained in the laboratory tests. The number of measurements was too small for any general quantitative validity to be given to them.  Despite the limited number of tests made, it can be assumed that, qualitatively, the results of the laboratory tests are transferable to the practical field concerning the pressure drop measured.  The analysis of the results obtained shows that the efficiency and pressure drop of the filters varies to a lesser or greater degree on the quantity of dust presented to the filter and that, in some cases, the values obtained with a concentration of 10 mg/cm3 differ from those corresponding to 100 mg/cm3.  The conclusion of the report is that the filter tests on the test rig permit the characteristics of the different filters to be compared with each other under given experimental conditions.]]></description>
      <pubDate>Wed, 06 Oct 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/15180</guid>
    </item>
    <item>
      <title>FILTRATION OF THE COMBUSTION AIR AND THE COOLING AIR OF MOTIVE POWER UNITS. OPERATING TESTS WITH AIR FILTERS</title>
      <link>https://trid.trb.org/View/15181</link>
      <description><![CDATA[This report deals with the operating tests on air filters carried out on behalf of the B 67 Specialist Committee. Their purpose was to ascertain whether, according to the quantity of dust retained, the filters used in service showed similar pressure drops to the filters tested in laboratory with the type of dust defined in Report No. 1 and using the concentrations selected for the tests described in Report No. 2.  Results show severe scatter of the points measured, but with a few exceptions, the points measured were within the range of pressure-drop curves ascertained in the laboratory tests.  The number of measurements was too small for any general quantitative validity to be given to them.  Despite the limited number of tests made, it can be assumed that, qualitativley, the results of the laboratory tests are transferable to the practical field concerning the pressure drop.]]></description>
      <pubDate>Wed, 06 Oct 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/15181</guid>
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    <item>
      <title>FILTRATION OF THE COMBUSTION AIR AND THE COOLING AIR OF MOTIVE POWER UNITS. INVESTIGATIONS CARRIED OUT BY THE SNCF IN THE FIELD OF DUSTS AND AIR-FILTERS</title>
      <link>https://trid.trb.org/View/15182</link>
      <description><![CDATA[This report forms the final reports of the B67 Committee. Besides a short account of the work of the Committee, it deals with the most important investigations carried out by the SNCF concerning the dust sucked in by motive power units and air filtration. The following work is described: Air sampling, Investigations on filters on the experimental vehicle, and Laboratory tests on filters.]]></description>
      <pubDate>Wed, 06 Oct 1976 00:00:00 GMT</pubDate>
      <guid>https://trid.trb.org/View/15182</guid>
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