AAR
See Association of American Railroads.
AAR Designations also Car Types (Article Reference Here)
The Association of American Railroads has 11 basic classifications of freight cars.
AAR - Association of American Railroads
The central coordinating and research agency of the North American rail industry.
AAR - The Association of American Railroads is a railroad trade association that establishes safety and equipment standards for North American freight railroads.
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AAR
Association of American Railroads. Represents the railroad industry in areas such as public relations, and advertising and establishes safety and equipment standards.
AB Valve ...
AAR
Association of American Railroads
The Association of American Railroads represents North America's major freight railroads and Amtrak. Association members include the BNSF, UP, KCS, CSXT, NS, CP, CN, TFM and FNM.
Absorbed Switching ...
AAR
Association of American Railroads, the trade association that represents the common interests of the railroad industry in such areas as standards, public relations, and advertising.
AC ...
AAR was created in 1934 by the merger of five industry-related groups: ...
An AAR Type "E" railroad car coupler (US)
An Amtrak EMD F40PH is one of many Cowl units
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Example AAR car designations found in the Official Railway Equipment Register. The NMRA recently reprinted the January 1953 ORER.
Boxcar, standard
XM ...
AAR Association of American Railroads. AB Valve The operating device used on freight cars for charging, applying, and releasing the brakes. Also called a triple valve ABD Valve An improvement of the AB Valve that features a quick release.
AAR - "Association of American Railroads", This trade group establishes safety and equipment standards.
Abandon - When a railroad ceases operation over a route with no intenttion of resuming service.
AAR Association of American Railroads. US body for determination of railway engineering standards, equivalent to the European UIC.
The late 1920s saw the introduction of the AAR standard "offset-side" 50- and 70-ton hoppers.
For whatever reason, I made reference to the AAR as the American Association of Railroads. It is actually the Association of American Railroads.
First of the Upper Michigan modeling series will be Copper Range (CR locally, AAR: COPR) diesels. COPR owned three, all Baldwin's, #100 & #101 were DS-4-4-1000's, and #200, which was bought later, an S12.
Here's another way of looking at it with a comparison to other scales. Note that the dimensions of the prototype are AAR (American Association of Railroads) standards.
 See also: Track, Locomotive, Standard, Engine, Train
  
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