The Automatic Warning System (AWS) is a form of limited cab signalling and train protection system introduced in 1956 in the United Kingdom to help train drivers observe and obey signals. It was based on a 1930 system developed by Alfred Ernest Hudd and marketed as the `Strowger-Hudd` system. An earlier contact system, installed on the Great Wes.....
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http://en.wikipedia.org/wiki/Automatic_Warning_System
a system using track beacons, such as magnets, contact ramps, or resonant circuits, which warns a driver if the signal being approached is not clear and applies the brakes if the driver does not acknowledge the warning
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=821-08-07
Refers to the specific form of limited cab signalling introduced in 1948 in the United Kingdom to help train drivers observe and obey warning signals.
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http://www.translationdirectory.com/glossaries/glossary256.php
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