The parties will appear before the Fair Work Commission for the second day on Friday after a long-running dispute related to the government's plan to bring a new Korean-built fleet onto the network sparked industrial action.
The Rail, Tram and Bus Union Union says there are safety issues with the stock and wants the government to address its concerns.
While the government previously offered to spend $264 million to settle the safety concerns, it declined to sign an agreement with a sceptical union to that effect.
"Every time unions think they have a breakthrough, a government commitment gets reversed and we're all back to square one," the NSW RBTU said on Thursday.
"It's like a never-ending game of snakes and ladders."Â
The government has gone to the commission to try to stop the union's protected industrial action, which has been taking place all week, after losing a similar bid at an interim hearing on Tuesday.
Transport for NSW said there will be fewer Sydney Trains and NSW TrainLink Intercity network services on Friday and commuters should plan ahead and allow for extra travel time.
"Commuters are experiencing longer journey times, less frequent services, and changes to stopping patterns across the public transport network due to industrial action, weather impacts, and COVID-related staffing shortages," Chief Operations Officer Howard Collins said.
The union says its industrial action, which includes bans on transit officers issuing fines on public transport and driving a small number of foreign-made trains, has had little impact on services.
"Throughout this whole dispute, we've always been as fair and reasonable as possible while still making it very clear to management and the NSW government that we are serious about fighting for the safe railway commuters and workers deserve," RBTU NSW Secretary Alex Claassens said.
The union has also accused the government of trying to link separate enterprise bargaining talks to the train stock dispute and "coerce" workers into accepting lesser terms.
Unions NSW has condemned the government's handling of the train dispute noting it's facing other actions by public sector workers.
"Premier (Dominic) Perrottet is playing the victim saying the strikes are politically motivated," it said on Thursday.
"Striking nurses, midwives, teachers, paramedics, child protection workers, cleaners, rail workers, bus drivers, road workers, and many more essential workers don't play politics".
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