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Web links - Company names, shortcuts
European Railway Agency - list of VKM's
    http://www.era.europa.eu/Document-Register/Pages/list-VKM.aspx
AAR Reporting Marks from the Canadian Freight Cars page of Ian Cranstone
    http://www.nakina.net/other/report/report.html
Railway Reporting Marks on the Piedmont and Western Railroad Club's homepage
    http://www.pwrr.org/rrm/index.html