I can't find any pictures which explain what happened.
https://www.theguardian.com/australia-news/2025/may/20/high-voltage-wire-collaps...Sydney commuters warned of ‘knock-on effects’ after
high-voltage wire falls on train causing major delays
Sydney commuters have been warned there could be “knock-on effects” on Wednesday morning after high-voltage wire fell on the top of a train on Tuesday afternoon, trapping 300 passengers and causing massive disruption across the city during the evening rush.
Howard Collins, the coordinator general for Transport for NSW, told reporters the incident happened at 2.30pm on Tuesday, leaving 300 passengers trapped at Strathfield in Sydney’s inner west and other trains stranded when the power was switched off.
Transport for NSW teams worked to allow passengers to safely leave the train and three others that had been stopped for safety reasons, with Collins telling reporters: “It’s life threatening if you get very near or touch wires with that amount of voltage … it will kill you straight away.”
“The most important thing here is safety, making sure we do that under safe conditions and there’s no risk of the power being switched on by accident or other means,” Collins said.
On Tuesday evening, the NSW transport minister, John Graham, said the passengers had “been taken off the stranded train that was entangled in wiring, as well as three other trains that were stopped with passengers onboard”.
“This is a very serious incident in a critical part of the rail network and we apologise to all train passengers affected and trying to get home tonight. The position of the train at Strathfield is [at] a major artery of the network and has caused huge disruption,” he said.
Sydney Trains is investigating the root cause of the incident.