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WESTLOCK Interlocking is a Computer-based interlocking (CBI) product now sold and maintained by Siemens Mobility Limited, following their purchase of Westinghouse Rail Systems. Westlock builds on many of the features that made SSI popular in the United Kingdom. This includes re-use of SSI's programming language and its track-side hardware.
The points indicator is in the form of a yellow light, lit only while the points are electrically detected in the required position. The whole line can be operated by just one or two signallers and needs very little infrastructure other than the track itself, making it a very cost-effective method.
A points operation lever and indicator (Signal 31) Most switch points, especially those located in stations and marshaling yards, are equipped with a position indicator (Signal 31), which is directly connected to the points operation mechanism. When the points are set to the through track, it displays an orange rectangle to the facing-point ...
A position light signal is one where the position of the lights, rather than their colour, determines the meaning. The aspect consists solely of a pattern of illuminated lights, which are all of the same colour. In many countries, small position light signals are used as shunting signals, while the main signals are of colour light form.
The warning was cancelled by the driver depressing a spring-laden toggle lever on the ATC apparatus in the cab; the key and circuitry was arranged so that it was the lever returning to its normal position after being depressed and not the depressing of the lever that reset the system - this was to prevent the system being overridden by drivers ...
The first such systems were installed on an experimental basis in the 1910s in the United Kingdom, in the 1920s in the United States, and in the Netherlands in the 1940s. . Modern high-speed rail systems such as those in Japan, France, and Germany were all designed from the start to use in-cab signalling due to the impracticality of sighting wayside signals at the new higher train spee
A later development was the upper-quadrant three-position semaphore signal. These worked in the upper quadrant to distinguish them from the then standard two-position lower-quadrant semaphores. When the arm is inclined upwards at 45 degrees, the meaning is "caution" and the arm in the vertical position means "clear".
The upper indicator shows the state of the forward block – along the line leading away from the signal box. The commutator is used by the signalman to indicate the state of his block, and the lower indicator displays this state, which is also displayed on a repeater indicator in the box for the block from which a train will come.