What do Railway semaphore signals mean?
Railway semaphore signal is one of the earliest forms of fixed railway signals. This semaphore system involves signals that display their different indications to train drivers by changing the angle of inclination of a pivoted ‘arm’.
What is the difference between home and distant signals?
A single distant signal will often provide a warning for both home and starting signals at a station. The distant shows a yellow (on) or green (off) light at night. Remember that the distant signal normally refers to more than one consecutive stop signal ahead.
What is Warner signal?
Warner Signals. A warner signal is used only in two-aspect signalling (2LQ, MLQ, 2CL). Its purpose is to warn of an approach to a stop signal further ahead, or to advise a driver of the condition of the block section being entered.
How do searchlight signals work?
When electricity flowing one direction is put through the field coil, the coil rotates moving the yellow roundel into the light beam. When electricity flows the opposite direction through the coil, it rotates in the opposite direction, placing the green roundel in the light beam.
What is semaphore code?
THE CODE: SEMAPHORE. EL SPRORE QQQQQQ. Semaphore is a flag-based communication system in which letters are represented by the way a person holds two flags. Once used by sailors to send messages to other ships, today this code is often used to signal airplanes.
What is the function of semaphore signal?
Semaphore, method of visual signaling, usually by means of flags or lights. Before the invention of the telegraph, semaphore signaling from high towers was used to transmit messages between distant points.
Are railway signals always on the left?
The signal is normally placed on the left side of the track with the arm directed over the offside. The standard arm is red with a white vertical band, although some older signals were plain red. To allow the signal indication to be seen at night, the arm is fitted with two lenses, duplicating the indication displayed.
What is the function of Semaphore signal?
Where was the first semaphore railway signal located?
German semaphore distant (left) and home (right) signal exhibition in Steinfurt, Germany. Semaphore is one of the earliest forms of fixed railway signals. These signals display their different indications to train drivers by changing the angle of inclination of a pivoted ‘arm’.
When does German semaphore signal show danger aspect?
German home semaphore signals (Haupt Formsignale) can display a danger aspect if the upper arm is in a 90 degree position (horizontal), and can display a proceed aspect if the upper arm is in a 45 degree position (diagonal).
How are the signals set up for a semaphore?
The semaphore itself (exclusive of the track circuit) operates from 12VDC. Although it is not standard convention for relays, they are shown in their “picked” position (energized). The signals are set up as 3 block intermediate signals, with no interlocking to complicate the relay logic.
Where is the semaphore post on a double track line?
Sighting problems may mean that the post is placed on the right of the other line on double track branches and on single lines, could be placed either side of the track. Note that US semaphore equivalents faced right and as generally on the European continent, on double track branches, up and down lines are opposite to those in the UK.