
Thousands of workers were left stranded on crowded platforms on Monday morning after an "operational" issue.
Sydney Trains usually expects 76 people to be on sick leave.
Taking to Twitter, Sydney Trains told commuters that service changes are likely to affect travel time as a number of trains have already been cancelled.
A number of frustrated public transport users have also taken to twitter to share photos and messages about the delays.
Mr Collins said it was "too early" to determine exactly which services would be affected in the afternoon.
"We are working hard to maintain a regular service, so changes are to be expected... Buses are being provided to supplement services & we will update this feed during the morning".
Transport Minister Andrew Constance has defended rail staff who do a "phenomenal" job in the face of significant population growth.
Extra customer service staff are in place at major stations such as Central and Town Hall to manage crowds. We can barely move.
More news: Minnesota kids diagnosed with rare, polio-like diseaseA number of services are also reportedly delayed.
'In the last two weeks, for instance, we've had some bad tragedies on our railway, ' he said.
Pressure on Sydney's Town Hall train station has grown significantly during peak periods due to a 23 per cent surge in passengers in just three years, raising the prospect of staff limiting access to platforms more often to avoid severe overcrowding.
He said they would attempt to spread the evening's cancellations across the network.
"Full fare refunds for Sydney commuters for avoidable delays", Opposition Leader Luke Foley said.
Meanwhile, Rail, Tram and Bus Union (RTBU) NSW Secretary, Alex Claassens, has asked passengers to direct their frustration at the government rather than the workers who are just as frustrated as commuters with the state of the network.
'It's the core responsibility of government to get the trains running on time and we're going to take a stand for the passengers, for the commuters, ' he said.
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