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Automatic Warning System (AWS) is a railway safety system invented and predominantly used in the United Kingdom. It provides a train driver with an audible indication of whether the next signal they are approaching is clear or at caution. [ 1 ]
In 1906, the Great Western Railway in the UK developed a system known as "automatic train control". In modern terminology, GWR ATC is classified as an automatic warning system (AWS). This was an intermittent train protection system that relied on an electrically energised (or unenergised) rail between, and higher than, the running rails.
The TPWS system is used in: The United Kingdom, with AWS magnets and with short overlaps; Victoria, Australia, without AWS magnets and with full-length overlaps; Since 1996, an older variant of TPWS, called the Auxiliary Warning System, has been used by the Mumbai Suburban Railway in India, on the Western Line and Central Line.
Accordingly, in 1988, BR launched a three-year program to develop and deploy this new system, with the aim of starting its implementation by 1992. It was assigned the name Automatic Train Protection (ATP), and was a considerably more comprehensive system than the Automatic Warning System (AWS) that was already in operation at that time. Whereas ...
A crocodile is a component of train protection systems used in France and Belgium. It works similarly to the Automatic Warning System (AWS) used in the United Kingdom. The crocodile can provide two different pieces of information to the driver, according to the aspect of the corresponding signal:
On the UK mainline, AWS consists of an on-board receiver/timer connected to the emergency braking system of a train, and magnets located in the center of the track. At each AWS site, a permanent magnet arms the system and an electromagnet connected to the green signal lamp disarms the system and a confirming chime is provided to the driver.
The passenger train operating company had failed to inform Railtrack and the signaller that the automatic warning system (AWS), which warns drivers of adverse signals, had been turned off in the cab of the HST. As a result, the signaller set a route which would stop the HST and allow the freight train to cross in front of it.
The Class 165 unit had been fitted with an Automatic Warning System (AWS) which required the driver to acknowledge a warning every time he approached a signal not at green. If an Automatic Train Protection (ATP) system had been fitted and working it would have automatically applied brakes to prevent the train going beyond any signal at red.
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