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Railroad Signaling 101 • Overview of signaling, not a “how to” • Focus on prototypes rather than modeling • Some basic terms • Why railroads developed signaling systems • Chronological approach • Basic overview without all the nuances • Bibliography has sources with more details
21 lip 2023 · reading signals: aspects and signal indications The lights displayed by a signal have three properties: aspect, name, and indication. The aspect describes what is displayed, e.g., red over green.
Chapter 1 - Introduction. So what are signals? We know what they are when we see one sitting alongside the tracks (commonly referred to as a wayside signal), but how many of us think of a flag as a signal? There are also hand signals, whistles and horns, and crossing gates in addition to the familiar wayside signal.
Rulebooks, most of which contain signal aspects for the territory they cover, are interesting reading. In addition to wayside signals, they also provide the reader with hand signals, whistle signals, and the rules that govern the operation of the railroad.
Searchlight signals were used by many railroads, with the big exceptions being the Pennsy and the B&O. The current mainstays of this type are the Alstom (GRS) SA-1 and SA-5, and the US&S H-2 and H-5 (6).
By definition, the signaling principles are the underlying principles of a signalling-based safeworking system that are based on the national standards but are independent of the requirements of a specific railway operating company and of the technology used.
Key historical events. 1840: Ball signals: LTC Rolt. 1841: Semaphore – Charles Gregory. 1851:Telegraph – Chas Minot. 1870: Track Circuit – William Robinson. 1871: Disk (Banjo) Signal – Thomas Hall. 1904: C olor light signals – William Churchill. 1915: Position-light signals – Arthur Rudd.
