NJ Transit and a locomotive engineer’s union are still negotiating with less than a day until a strike deadline. At a press conference Wednesday night, NJ Transit CEO Kris Kolluri and union officials expressed optimism about a deal being made before midnight.

NJ Transit President and CEO Kris Kolluri said the two sides have had “constructive” meetings this week in Newark and in Washington D.C.

NJ Transit rail engineers are set to strike if a deal cannot be reached by the midnight deadline, impacting hundreds of thousands of commuters.