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Light R: Y: G: W: blank space: Standard spotlight-style indicators. Lower-case letters indicate blinking lights. Semaphore R: Y: G: blank space: Modern upper-quadrant, 3-position semaphore signals. Sema2 R: y: G: g: blank space: Lower-quadrant, 2-position semaphore signals. Upper-case letters indicate a main signalhead, while lower-case ...
Light R: Y: G: W: blank space: Standard spotlight-style indicators. Lower-case letters indicate blinking lights. Semaphore R: Y: G: blank space: Modern upper-quadrant, 3-position semaphore signals. Sema2 R: y: G: g: blank space: Lower-quadrant, 2-position semaphore signals. Upper-case letters indicate a main signalhead, while lower-case ...
Semaphore signals have been almost completely replaced by light signals in North America, but they contain several important design elements. The overwhelming majority of semaphore type signals used in North America, and the only type surviving in service as of 2009 are of the three position, upper quadrant variety.
Semaphore signals were patented in the early 1840s by Joseph James Stevens, and soon became the most widely used form of mechanical signal. Designs have altered over the intervening years, and colour light signals have replaced semaphore signals in most countries, but in a few they remain in use.
Sailor with signal lamp. A signal lamp is a semaphore system using a visual signaling device, often utilizing Morse code. In the 19th century, the Royal Navy began using signal lamps. In 1867, then Captain, later Vice Admiral, Philip Howard Colomb for the first time began using dots and dashes from a signal lamp. [6]
All aspects are indicated with colour light signals. Despite this re-signalling, some parts of the TransAdelaide network still use the original 3-position speed signalling (such as the Dry Creek to Port Adelaide line). There is also a low speed aspect indicated by a lunar-white position-light signal mounted below the main head.
This diagram uses embedded text that can be easily translated using a text editor. Licensing Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License , Version 1.2 or any later version published by the Free Software Foundation ; with no Invariant Sections, no Front-Cover Texts ...
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