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Railroad Signals of the U.S. Full CPL Signal recently seen for sale on Facebook Marketplace. $1000, sale is pending, darn. Extremely good deal considering it has -everything-, including original pole, ladder, finial, platform, and electrical.
To intelligently discuss a signal, you need to be able to differentiate between a signals aspect, indication, and name (and maybe the rule it is associated with). Name - The name of a signal is just that, what the signal is called when you look in a rule book or talk about it to others.
Prior to 1900, signal styles were a lot more individualistic, and could vary widely from railroad to railroad. More and more today, the American signal scene is finding color light signals, where there was once a wide array of styles to feast on.
Colorlight signals make up the bulk of railroad signals today, and probably every new installation is done with them. Most of the class 1 railroads have been in the process of replacing older style signals with.
In the United States, most signal systems relay either speed information (predominate in the east) or routes (prevails in the west) to the engineer. In Britain, signals indicate the condition of the track ahead, and it is left up to the engineer to adjust his speed accordingly.
After the semaphores came a plethora of signal types: colorlights, searchlights, position lights (PL's), and color position lights (CPL's). Colorlight signals were made by everyone. They could be vertical as most railroads employed, or horizontal as the CNW did.
Rulebook found here: http://0924.utu.org/Files/[3100]2014%20CSX%20Rule%20Book.pdf The pages were screen-captured and edited to be all the same in size, and we cleaned ...
Semaphore signals revolutionized and standardized the railroad signal industry at the same time. Compared to earlier signals, they provided the railroads with a superior method of transmitting track conditions to the engineer.
Ball signals were an early form of railroad signaling. They were simple devices, consisting of a "ball" suspended on a rope that usually ran around two pulleys, so the ball could be raised and lowered.
This page covers signals known as Banjo Signals. Thomas Seavy Hall invented the Banjo signal in 1869, two years before forming the Hall Signal Company. It is given that name because of it's appearance, and how it resembles the bottom of an inverted banjo.