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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.
Standards for North American railroad signaling in the United States are issued by the Association of American Railroads (AAR), which is a trade association of the railroads of Canada, the US, and Mexico.
Modern AAR standards require knuckle couplers to be bottom-operated on cars and top-operated on locomotives. [11] Operation or uncoupling is accomplished by lifting the release pin with a lever extending to the corner of the car; this pin is locked when the coupler is under tension, so the usual uncoupling steps are to compress the coupling ...
Lemon Yellow (The AAR's official name) - Used in position light systems as an all-purpose high visibility color, greatest fog penetration. (Plain) White - Plain incandescent white light. Used in dwarf position light signals with frosted lenses. Individual signal heads may be set to flash a color to create a different signal aspect.
The ARA became the Association of American Railroads (AAR) in 1934; the Signal Division was renamed the Signal Section and the Telegraph and Telephone was renamed the Communications Section. The two sections merged in 1961 to become the Communications and Signal Division of the AAR, which has now been merged into AREMA.
The most widespread standards are AAR Plate B and AAR Plate C, [31] but higher loading gauges have been introduced on major routes outside urban centers to accommodate rolling stock that makes better economic use of the network, such as auto carriers, hi-cube boxcars, and double-stack container loads. [32]
The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. Essentially a simplification of the European UIC classification , it is widely used in North America to describe diesel and electric locomotives (including third-rail electric ...
As part of the AAR's adoption of a standard based on Amtech technology, AAR required that Amtech license that technology. At the time of the AAR's 1991 mandate, six vendors sold AEI site equipment. Those vendors were US&S, Safetran, Harmon, VideoMasters, CCTC International in partnership with IBM, and Southern Technologies. [1]