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Automatic Warning System — 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… … Wikipedia
Punktförmige Zugbeeinflussung — The Punktförmige Zugbeeinflussung (PZB, point wise train protection ) is an intermittent cab signalling system and train protection system used in Germany, Austria, Slovenia, Croatia, Romania and on one line in Canada. It is also known as… … Wikipedia
Differences between Malaysian and Indonesian — The differences between Malaysian (Bahasa Malaysia) or Malay (Bahasa Melayu) and Indonesian (Bahasa Indonesia) are significantly greater than those between British English and American English. They are roughly mutually intelligible, but with… … Wikipedia
Variable-frequency drive — A variable frequency drive (VFD) is a system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor.cite book | first=Sylvester J. |… … Wikipedia

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