Fans were advised to stay at Sydney Olympic Park and enjoy the entertainment after the match due to the delays.
Shortly before 10.30pm, Sydney Trains warned travellers of delays as a result of power supply issues at Ashfield on the T2 line.
The operator blamed “vandalism of equipment” for the problems.
“Some trains are running late, may have changed stops, & journey times may take longer,” it said on X, the social network formerly known as Twitter.
“Work crews are on site, however we have no forecast for trains to resume normal running.”
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Earlier, fans with tickets making a late dash to the semi-final were left in the lurch when urgent repairs to trains at Redfern Station caused some delays.
Transport for NSW said that while services were running frequently, trips to Olympic Park were taking about 15 minutes longer than expected.
Meanwhile in Melbourne, fans stormed barriers after the live site reached capacity.
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