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The Hall disc signal (also called a "banjo" signal) was the first electrically operated signal to be widely adopted by American railroads. Thomas Hall patented his disc signal design in 1867. [2]: 146–147 A banjo-shaped wooden case housed a large iron wire hoop with red silk stretched and glued over it.
In 1992, the American Association of Railroad Superintendents (AARS) convened a special committee, which suggested to its board of directors, executive council, and membership that “the AARS sponsor a full conference on the standardization of railroad operating rules, practices, and procedures, and that this conference be conducted on the ...
Another term for a clear signal, derived from the days of steam where a station operator would hoist a large wooden ball up a standard, signaling that the engineer was authorized to proceed [38] [71] [134] [136] A slang term used among railroad employees to convey to the crew of a train that they were clear to proceed [137] [138] High cube (US)
The system is in service on the Metra Rock Island District between Blue Island and Joliet. Rapid Transit Lines: Various rapid transit lines built or re-signaled in or before the 1990s make use of the pulse-code cab signal technology for both manual or automatic train operation schemes. Rapid transit systems are typically failsafe with a 0 code ...
The Hall Signal Company was an American manufacturer of railway signaling equipment in the 19th and 20th centuries. Hall's equipment was widely used by American railroad companies. The company's founder, William Phillips Hall, was an inventor who developed several important devices in the history of railway signalling.
Highball Signal – Historic railroad signal in Delmar, Delaware, US; North American railroad signals; Railway signalling – Principle of signals used to control railway traffic; Train protection system – Railway fail-safe against human error; Train speed optimization – A system that reduces the need for trains to brake and accelerate
The first reached by a train is known as the home signal. The last stop signal, known as the starting or section signal, is usually located past the points etc. and controls entry to the block section ahead. The distance between the home and starting signals is usually quite short (typically a few hundred yards), and allows a train to wait for ...
These two mechanisms for control would be formalized by American railroad companies in a set of procedures called train order operation, which was later partly automated through use of Automatic Block Signals (ABS). The starting point of each system was the railroad timetable that would form the advanced routing plan for train movements. Trains ...