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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>RELIABILITY OF RAILROAD ROLLER BEARINGS</title>
      <link>https://trid.trb.org/View/44161</link>
      <description><![CDATA[Bearing defect data from 8000 railroad roller bearings were analyzed to determine their defect modes and defect rate distributions.  Cone bore growth, brinelling, and fatigue were identified as the predominant defect modes as bearings age at least through age 12 years.  The observed data were fitted with a Weibull failure distribution and estimates were made of the Weibull parameters.  A comparison was also made between the incidence of fatigue spalls and estimates of fatigue life based on the AFBMA method.  The results of the study show that, after only two years of service, ten percent of all railroad roller bearings exhibit a defect of one type or another for which at least one component would be condemned if it were in a rework shop.  The present AFBMA method of calculating fatigue spalling, modified to account for lubricant film thickness effects, correlates reasonably well with the observed incidence of spalling (10 percent fatigue life of about 11 years).  The problem lies in the fact that the AFBMA calculation procedure ignores the other competing defect modes which contribute far more to the overall defect rate than does spalling.  One of these, cone bore growth, is a major contributor to the overall defect rate and deserves special attention.  The relationship between "defect rate" and "failure rate" is not direct, and an examination of "condemning limit" definitions relative to the progression of bearing failure in service is needed.]]></description>
      <pubDate>Tue, 26 Oct 1976 00:00:00 GMT</pubDate>
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      <title>DEFECT REPORTING</title>
      <link>https://trid.trb.org/View/16294</link>
      <description><![CDATA[The problem of engineers' defect work reports, relating from trouble in having crews furnish them, maintenance people using them properly and correcting items reported on them, and other related problems associated with work reports, has been one of controversy for many years.  Engineers do not always seem to appreciate the task of furnishing work or defect reports and yet an intelligent work report has no limit as to the valuable information it can furnish the maintenance man and the railroad.]]></description>
      <pubDate>Fri, 18 Jun 1976 00:00:00 GMT</pubDate>
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