The system automatically shut down following a communications fault, Transport for Greater Manchester said.
The fault was fixed shortly after midnight and trams are now set to operate normally, said a spokesman.
Transport for Greater Manchester said it was "not an issue Metrolink has experienced previously".
It was caused by "a component attached to the Metrolink control network sending out spurious communications, which resulted in the safety system correctly shutting down". BBC News article.
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House of Lords report - Civilian Use of Drones in EU.pdf
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