NJ Transit and the Brotherhood of Locomotive Engineers and Trainmen met in Washington, D.C., on Monday. The talks come just days before a possible train strike that could begin Friday.
News 12 sources say the two sides are not close to an agreement.
The union is pushing for higher salaries.
The meeting was held with the National Mediation Board.
If no deal is reached, the commute for hundreds of thousands could be disrupted.