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[quote user="Paul_D_North_Jr"] Link to a Transport Safety Board of Canada report with an analysis and excellent discussion of this subject - see esp. the Appendices and the references:  Report Number R00H0004 - <a href="http://66.203.200.38/eng/rapports-reports/rail/2000/r00h0004/r00h0004.asp">http://66.203.200.38/eng/rapports-reports/rail/2000/r00h0004/r00h0004.asp</a> [/quote] Paul, Thanks for posting those reports.  The following is quoted from the first link in a discussion of how slack action can cause a pressure drop in the trainline sufficient to dynamite the train: "1.17 UDE Research Although most UDEs occurred subsequent to a service brake application, the report also concluded that slack action (draft and buff forces), accompanying or in the absence of a service brake application, may cause short-duration bpp reductions, leading to UDEs. During this testing, it was demonstrated that severe slack action alone can produce sharp bpp reductions of up to 2 psi. Laboratory work also showed that control valves could respond to slack-induced bpp reductions and initiate a UDE."   What I would like to know is how it is possible for slack action to affect the trainline pressure.
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