Train commuters in NSW are being told to make other arrangements as rail workers strike over the lack of progress on a new enterprise bargaining agreement.

Commuters on Sydney Trains and the NSW TrainLink Intercity network will have fewer services on Wednesday, with some running to a reduced timetable and others replaced with buses.

Transport for NSW chief operating officer Howard Collins said travellers should “expect your trip to be impacted and longer than usual”, with disruption all day and only about 30 per cent of services running.

People should use trip planning apps and the Transport for NSW website to find the latest information and alternative travel options.

Crews are refusing to drive privately built trains, which include Waratah and Millennium trains.

Sydney Trains chief executive Matt Longland said those comprise “about two-thirds of our available trains”.

The Rail Tram and Bus Union says it was forced to take industrial action after a continued refusal to meet with workers to negotiate fair wages and conditions.

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RTBU state secretary Alex Claassens told AAP the union hoped a four-hour stop work action last month would have been sufficient to bring senior management to the table to negotiate a new enterprise bargaining agreement, but that hadn’t happened.

He said the union hoped for “serious movement” in the negotiations after a meeting scheduled for 10am on Wednesday, which he hoped Mr Longland would attend, unlike previous negotiations with junior managers “quoting out of the script”.

Negotiations have been stalled for months amid union concerns about the further privatisation of services and jobs, as well as the cleanliness of trains.

TRAIN LINES WITH REDUCED FREQUENCY WILL STOP AT ALL STATIONS ON:

* T1 North Shore & Western

* T2 Inner West & Leppington

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* T3 Bankstown

* T4 Eastern Suburbs & Illawarra

* T7 Olympic Park

*T8 Airport & South

* T9 Northern

* Blue Mountains

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* Central Coast & Newcastle

* South Coast

BUSES WILL REPLACE TRAINS FROM:

* Lidcombe to Bankstown

* Macarthur to Campbelltown

* Port Kembla to Thirroul

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* Schofields to Tallawong

AAP