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NSW Transport Minister Jo Haylen says the NSW government and union are "a long way apart" in their negotiations.

Matt Longland says New Year's Eve is the busiest night of the year for Sydney Trains.

He says 1,000 additional train services have been scheduled for the night.

"We've been planning a number of agencies, including Sydney Trains, for the last nine months to prepare for New Year's Eve. We've got a thousand extra train services planned, staffed, rostered and ready to operate and that's what we intend to do," he says.

Matt Longland says his focus is to resolve the enterprise bargaining agreement dispute with the union. 

"Our focus as recently as earlier today has been to resolve the outstanding issues of the enterprise bargaining agreement. That's what we want," he says.

Sydney Trains chief executive Matt Longland says the Rail, Tram and Bus Union has notified the department of 200 bans.

He says he's unsure which bans will be applied in the coming days as part of the industrial action.

Jo Haylen says the government hasn't been notified by the union about which train services will be impacted.

She says commuters should check their travel apps for updates.

"At this stage, we haven't been notified by the union as to how they will implement those bans but we will make sure that passengers are kept up to date," she says.

Transport Minister Jo Haylen says the government won't negotiate with the Rail, Tram and Bus Union "with a gun to our head".

"We will not negotiate with a gun to our head and we want a service that is reliable for families and businesses this time of the year and that is why the government is taking legal action to protect passengers," she says.

Sydney Trains chief executive Matt Longland says the impact of the rail industrial action could be felt within days. 

"This will be a significant impact for the travelling public in the coming days and weeks. We will do everything we can to minimise that impact," he says.

Transport for NSW secretary Josh Murray says the industrial action could impact 50 per cent of train services. 

"That is not just impractical, it is not just a nuisance factor for government as was stated, it is reckless. It is impossible to run New Year's Eve at that kind of restriction," he says.

Jo Haylen says the NSW government has lodged an application to the Fair Work Commission to limit the impact of industrial action. 

"That application is around the grounds of community safety and economic harm. The government is pursuing all legal avenues to prioritise passengers, to protect them and businesses this time of the year," she says.