Association of American Railroads#Functions

AAR was created October 12, 1934, by the merger of five industry-related groups:{{cite book | last = Association of American Railroads | title = Born out of necessity | year = 1988 | publisher = Association of American Railroads | location = Washington, D.C. | oclc = 80370940 | page = 4}}

• The American Railway Association
• The Association of Railway Executives
• The Bureau of Railroad Economics
• The Railway Accounting Officers Association
• The Railway Treasury Officers Association

William George Besler was its first President.

The AAR is headquartered in Washington, D.C., not far from the Capitol. Its information technology subsidiary, Railinc, is based in Cary, North Carolina. Railinc IT systems and information services, including the Umler system, the Interline Settlement System and Embargoes system are an integral part of the North American rail infrastructure. Railinc delivers approximately nine million messages each day over its EDI network, including transportation waybills, advance train consists, blocking requests and responses and trip plans. Its applications support railroads, equipment owners and rail industry suppliers along every link of the supply chain. The company maintains the only industry-accepted version of the North American railroad industry's official code tables. Beginning as an information technology department within the Association of American Railroads (AAR), the company was established as a wholly owned, for-profit subsidiary of the AAR in 1999.

Another subsidiary, the Transportation Technology Center, Inc. (TTCI), operates and maintains the Transportation Technology Center, a {{convert|52|sqmi|km2|adj=on}} facility {{convert|21|mi|km}} northeast of Pueblo, Colorado, owned by the United States Department of Transportation. The facility is under a care, custody and control contract with the Federal Railroad Administration. TTCI has an array of specialized testing facilities and tracks. The site enables testing of freight and passenger rolling stock, vehicle and track components, and safety devices.{{cite web| url=http://www.aar.com| title=Transportation Technology Center| access-date=2007-04-19| archive-url= https://web.archive.org/web/20070501005251/http://www.aar.com/| archive-date= 1 May 2007 | url-status= live}}

Where appropriate, the AAR represents its members' interests to the public at large and to Congress and government regulators in particular. The AAR works to improve the efficiency, safety and service of the railroad industry, such as through its responsibility for the industry's interchange rules and equipment specifications, e.g. for locomotive multiple unit control.{{Cite web |url=http://www.railway-technical.com/us-musp.shtml |title=US Loco MU Control |access-date=2008-02-13 |archive-url=https://web.archive.org/web/20080201090339/http://www.railway-technical.com/us-musp.shtml |archive-date=2008-02-01 |url-status=dead }}

One of the AAR's duties is to oversee the assignment of reporting marks – two to four letter codes that uniquely identify the owner of any piece of railroad rolling stock or intermodal freight transport equipment (trailers, semi-trailers, containers, etc.) that can be carried on a railroad.

In November 2013 the AAR urged the U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA) to press for improved tank car safety by requiring all tank cars used to transport flammable liquids to be retrofitted or phased out, and new cars be built to more stringent standards."{{cite news|title=CN responds to CBC questions on DOT-111 tank cars|date=10 January 2014|access-date=18 February 2014|publisher=CBC News|url=https://www.cbc.ca/amp/1.2492116}}

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• Alaska Railroad Corporation
• Railroads owned by Anacostia Rail Holdings Company
• BNSF Railway Company
• Canadian National Railway Company
• Canadian Pacific Kansas City
• CSX Transportation, Inc.
• Florida East Coast Railway
• Railroads owned by Genesee & Wyoming Inc.
• Indiana Rail Road Company
• Iowa Interstate Railroad, LLC
• Metra
• National Railroad Passenger Corporation (Amtrak)
• Norfolk Southern Corporation
• Railroads owned by R.J. Corman Railroad Group, LLC
• Union Pacific Railroad
• Vermont Rail System
• Railroads owned by Watco
• Wheeling & Lake Erie Railway{{cite web|url=https://www.aar.org/about-us/aar-members/ |title=AAR Members |date=nd |publisher=Association of American Railroads |access-date=16 August 2023 }}

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• Canadian Pacific Kansas City (Mexican Operations)
• Ferrocarril del Istmo de Tehuantepec
• Ferrocarril y Terminal del Valle de México
• Grupo México Transportes

• Canadian Pacific Railway
• Ferrosur
• Kansas City Southern de México
• Kansas City Southern Railway
• Pan Am Railways

• American Railway Association
• Organisation for the Combined Operations of Railways (OSShD)
• International Union of Railways (UIC)
• African Union of Railways (AUR)
• AAR wheel arrangement

{{Reflist|30em}}

• {{cite book| editor1-last=Middleton| editor1-first=William D.| editor2-first=George M.| editor2-last=Smerk| editor3-first=Roberta L.| editor3-last=Diehl| title=Encyclopedia of North American Railroads| publisher=Indiana University Press| year=2007| pages=149–50}}

{{Commons category|Association of American Railroads}}

• [http://www.aar.org/ Association of American Railroads website]
• [http://www.railinc.com/ Railinc]
• [http://www.aar.com Transportation Technology Center]
• [http://www.railserve.com/aar_railroad_reporting_marks.html Association of American Railroads (AAR) Reporting Marks]
• [http://libraries.psu.edu/findingaids/1421.htm AAR Records 1939~1978, PSU Library] {{Webarchive|url=https://web.archive.org/web/20210111171957/https://libraries.psu.edu/findingaids/1421.htm |date=2021-01-11 }}

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Category:Rail transportation in North America

Category:Trade associations based in the United States

Category:1934 establishments in Washington, D.C.

Category:Railway associations