Train services on Adelaide's Seaford and Flinders rail lines have resumed after being stopped for two hours this morning due to a power outage.
Services resumed about 8:45am.
Some trains on the track were unable to move during the outage, which affected services north of Lonsdale, where the electric service's substation is located.
Passengers were evacuated from a train at Mitchell Park and substitute buses and taxis were organised for some commuters.
An Adelaide Metro spokeswoman said the cause of the fault was still being investigated "but at this stage, it is believed a tree branch fell onto the wiring".
"Updates will be provided as more information becomes available," she said.
"We apologise for the delay and thank people for their patience."
A caller to ABC Radio Adelaide said she was worried her son would miss his year 12 exam.
"My son is on the train and he's got his physics exam this morning and the train is stopped and my understanding is they've got a diesel train running and he's off to school now," she said.
University exams are also being held today at the Adelaide Showground, which is on the Seaford and Flinders lines.
Adelaide's other railway lines use diesel trains, so were not affected.
Adelaide has been hit by windy weather overnight, with trees down across the metropolitan area.
Rain is expected to hit this afternoon.
Bureau of Meteorology duty forecaster Hannah Marsh said a front was taking its time to reach the city, with up to 10mm of rain possible.
"We're starting to see it reaching Port Wakefield to Balaklava sort of area, so we're looking at it getting to the northern suburbs late this morning," she said.
"It will take some time to cross the metro area, so gradually moving south during the afternoon, and may not even reach the far southern suburbs until towards evening."
Ceduna has already recorded 35 millimetres of rain, and the Nullarbor 33mm.
The cold front is expected to linger until next Tuesday.
Road Safety Minister Vincent Tarzia urged drivers to take care on the roads during today's weather.
"Let's make sure we look at alternative routes, let's make sure we get to work safely and home safely as well," he said.
"If it is extra wet and windy on our roads today, let's make sure we drive to the conditions."
© ABC 2021
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