"Weekend trackwork" are two words Illawarra commuters never want to hear - but this weekend it could be even worse.
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Buses are replacing trains on Saturday and Sunday between Bomaderry and Wollongong.
And Transport for NSW said those rail buses will have to conform to the same social distancing guidelines as other public transport buses.
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That means no more than 12 people per bus.
"Physical distancing measures also apply on rail replacement buses," a Transport for NSW spokeswoman said.
"During planned maintenance, Transport for NSW will provide extra rail replacement services to allow for physical distancing and the number of passengers using rail services.
"Transport for NSW encourages customers to plan ahead, be prepared for your trip to look different and please consider all options available before you start your journey."