Section K Part IV - Office Architecture and Railroad Electronics Messaging - PDF (Electronic) Additionally, an AAR Circular Letter subscription is required as this is the vehicle used for the distribution of all new and revised standards. Circulars are issued at least monthly and include industry letter ballots and results, arbitration decisions, notification of rules and standards revisions, industry early warning and maintenance advisories, and other information related to mechanical rules and standards. Subscription to Circular Letters of the AAR Technical Services division is available in electronic format (online access via AAR’s Web page at http://aarcirculars.aar.org).
Documentation specifies the Edge Message Protocol (EMP) message envelope which describes the fields of the envelope, their semantics, and commentary about their use.
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