NSW Health says anyone who travelled on the same rail services as an infected hotel worker should get tested for COVID-19.
Those who shared a train carriage with the woman are deemed close contacts and have been asked to isolate for 14 days from their potential exposure.
A full list of affected train services and carriages is available on the NSW Health website.
NSW recorded no new locally transmitted cases overnight, with two new cases detected in people returning from overseas travel.
Tweet from @NSWHealth
The infected woman’s infection sparked widespread alarm on Thursday, with fears Western Australia could withdraw its promise to open its border up to NSW and Victoria from next Tuesday.
WA Premier Mark McGowan says he will take the weekend to consider the situation.
However, Queensland authorities say its borders will remain open for now after travel restrictions were lifted on Tuesday.
Queensland recorded two new cases of coronavirus in hotel quarantine.
Tweet from @AnnastaciaMP
Elsewhere, Victoria recorded 36 consecutive days without a new COVID-19 infection, with 7,670 test results were conducted in the past 24 hours.
The latest figures come as Premier Daniel Andrews is expected on Sunday to announce further relaxation of coronavirus restrictions.
The NSW case is the only local infection in the state in the past 27 days.
Had she not been diagnosed, NSW would have been considered to have eliminated the virus on Saturday.
State health authorities breathed a massive sigh of relief after it was confirmed the case was not transmitted locally.
But with the woman’s contacts still undergoing testing and hundreds potentially exposed on public transport, the state is not out of the woods yet.
Genome sequencing on Friday confirmed that the infected Sydney quarantine hotel cleaner contracted the virus at work.
A NSW Health spokesperson on Friday afternoon said the infection likely came from a US source.
The source of infection may be international aircrew who were self-isolating in the hotel at the time, they said, however investigations are continuing.
Airline crews from overseas stay in quarantine hotels before flying out again.
Testing of the woman’s contacts is continuing, but there have been no further positive results so far.
A visibly relieved Health Minister Brad Hazzard broke the good news on Friday.
“It’s a massive relief,” he told reporters.
-with AAP
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