Write a note on automatic power signal.
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Drivers need to be aware of which signals are automatic. In current British practice for example, automatic signals have a white rectangular plate with a black horizontal line across it. In US practice a permissive signal typically is indicated by the presence of a number plate.
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Explanation:
Automatic Block Working is a system of train working in which movement of the trains is controlled by the automatic stop signals. ... (a) The line is track circuited throughout its length and divided into a series of automatic signalling sections each of which is governed by an Automatic Stop Signal.
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