Sydney and regional city commuters are facing disruptions to train services despite the NSW government agreeing to the rail union's major demands on Wednesday.
Peak hour services are being reduced from every few minutes to 15 minutes with trains running to a reduced-frequency timetable.
What is the cause of the disruption?
Sydney Trains blamed ongoing industrial action for the inconvenience, but the Rail, Tram and Bus Union RTBU accused the operator of deliberately slowing down trains.
On Thursday, drivers were going to take action, including a ban on travel on trains while on duty.
It meant that they needed to take taxis to move around the network, which Sydney Trains said took more time.
It followed industrial action earlier this week after a breakdown in talks about the union's concerns about safety with a new fleet of inner city trains.
The trains were running slower than 60 kilometres an hour on Tuesday.
What does the government have agreed on?
Today's action went ahead despite the government making a $264 million offer to fix the New Inner-City Fleet at the centre of the dispute.
The union has called for the trains to be modified to allow guards to check platforms and make sure gaps are clear, from Sydney to Lithgow, Kiama, and the Central Coast.
The government has maintained they were safe, but on Wednesday Transport Minister David Elliot backed down and agreed to make modifications to put an end to the chaos caused to commuters.
Am I happy about spending millions of dollars to modify what the safety regulators have said are perfectly good trains? Mr Elliot said on Wednesday that he was absolutely not.
The government has agreed to negotiate on pay and allowances.
Why are there still disruptions?
The documents outlining the government's latest offer didn't have been published until late on Wednesday night, according to RTBU NSW secretary Alex Claassens.
We have got to work through that, and we have to make sure that everything is covered off in the letter, Mr Claassens said.
The union and Sydney Trains met today to discuss the offer.
Claassens was doubtful of resolving the long-running dispute in time to call off further industrial action planned for Friday.
We don't know what's in the offer yet. We're going to sit there today and go through it line by line. Claassens said they had been arguing to make trains safer for six years.
If an agreement is not finalised today, drivers will refuse to drive foreign-made trains, which is expected to result in the cancellation of half of the timetabled services.
Sydney Trains was hopeful of avoiding that situation.
"We're sitting down with the unions to go through it line by line and hopefully put these disruptions to an end," Longland said.
We think it's a fair offer and we're keen to work with unions to get through the details. Mr Elliot said on Wednesday he expected the union to act in good faith and train services to run as normal on Friday.