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Signal types. North American signals are commonly of three types. Absolute – Absolute signals are usually connected to an interlocking controlled by a block operator or train dispatcher. Their most restrictive aspect is "stop" and trains cannot pass them at stop unless they obtain special authority.
Railway signalling. A Class 66 locomotive (right) is waiting at a red signal while a First Great Western (now Great Western Railway) passenger train (left) crosses its path at a junction. Railway signalling ( BE ), or railroad signaling ( AE ), is a system used to control the movement of railway traffic. Trains move on fixed rails, making them ...
A 17th century fire or light ball from Veste Coburg, Germany. Incendiary weapons, incendiary devices, incendiary munitions, or incendiary bombs are weapons designed to start fires. They may destroy structures or sensitive equipment using fire, and sometimes operate as anti-personnel weaponry. Incendiaries utilize materials such as napalm ...
Flag semaphore (from the Ancient Greek σῆμα ( sêma) 'sign' and - φέρω (- phero) '-bearer' [1]) is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands. Information is encoded by the position of the flags; it is read when the ...
In both cases, the left signal shows "danger". A railway signalis a visual display device that conveys instructions or provides warning of instructions regarding the driver's authority to proceed.[1] The driver interprets the signal's indication and acts accordingly. Typically, a signal might inform the driverof the speed at which the train may ...
In telecommunications and signal processing, baseband is the range of frequencies occupied by a signal that has not been modulated to higher frequencies. [ 1] Baseband signals typically originate from transducers, converting some other variable into an electrical signal. For example, the electronic output of a microphone is a baseband signal ...
A railway detonator, ( torpedo in North America) or fog signal is a coin-sized device that is used as a loud warning signal to train drivers. It is placed on the top of the rail, usually secured with two lead straps, one on each side. When the wheel of the train passes over, it explodes, emitting a loud bang. It was invented in 1841 by English ...
Signal processing is an electrical engineering subfield that focuses on analyzing, modifying and synthesizing signals, such as sound, images, potential fields, seismic signals, altimetry processing, and scientific measurements. [ 1] Signal processing techniques are used to optimize transmissions, digital storage efficiency, correcting distorted ...