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There are two main types of signaling aspect systems found in North America, speed signaling and weak route signaling. [citation needed] Speed signaling transmits information regarding how fast the train is permitted to be going in the upcoming segment of track; weak route signaling transmits information related to the route a train will be taking through a junction, and it is incumbent upon ...
North American railroad signaling. 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. Their system is loosely based on practices developed in the United Kingdom during the early years of ...
A 45-mile-per-hour (72 km/h) speed restriction sign at Metro-North Railroad 's Port Chester station. Rail speed limits in the United States are regulated by the Federal Railroad Administration. Railroads also implement their own limits and enforce speed limits. Speed restrictions are based on a number of factors including curvature, signaling ...
The GCOR rules are intended to enhance railroad safety. The rules cover employee responsibilities, signaling equipment, procedures for safe train movement, dealing with accidents and other topics that directly and indirectly affect railroad safety. Some railroads modify the GCOR rules to suit their specific operations.
Northeast Operating Rules Advisory Committee. The Northeast Operating Rules Advisory Committee (NORAC) is a body of railroads that establish a set of operating rules for railroads in North America. The NORAC rulebook is used by full and associate member railroads, located mostly in the Northeast United States.
railroads.dot.gov. The Federal Railroad Administration (FRA) is an agency in the United States Department of Transportation (DOT). The agency was created by the Department of Transportation Act of 1966. [ 3 ] The purpose of the FRA is to promulgate and enforce rail safety regulations, administer railroad assistance programs, conduct research ...
a 'block free' signal (green), meaning that the next block is clear or, in the case of a distant signal, that the next signal is also green; Warning signals or speed limits (yellow) requiring the driver to slow the train and especially to be able to stop before the next stop signal; Stop signals (red) require the train to stop.
Application of railway signals. Semaphore stop signals protecting the convergence of two tracks into one. The application of railway signals on a rail layout is determined by various factors, principally the location of points of potential conflict, as well as the speed and frequency of trains and the movements they require to make.