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The power supply system is designed and operated under the "fail-safe"
principle. The "fail-safe" feature ensures that, in the event of a fault
of power supply equipment, the system will be de-energised so that it will cause
no harm to other devices or danger to personnel. Under the circumstance that the
failure causes the loss of train power supply, the emergency lighting and ventilation
fans within the train will continue to operate with power supplying from the standby
batteries of the train.
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