Sydney trains have returned but an investigation continues into why a communications failure caused the entire network to shut down, stranding thousands of peak-hour commuters.
Trains ground to a halt at 2:45pm and did not resume running until more than one hour later.
The breakdown occurred in the digital radio system that signallers and train controllers use to stay in contact with crews, Transport Management Centre spokesman Derrick Peterson said.
Soon passengers took to social media to report being stuck at stations and halted mid-journey, and large queues began forming around platforms.
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