The strike would shut down the Northeast Corridor, which carries more than half of NJ Transit's 740 daily trains.
Transit officials say commuters may need to rely on shuttle bus service to get to some PATH stations. Midtown Direct trains would be rerouted to Hoboken, and some of those would be combined to avoid congestion in Hoboken.
A strike would also cause a partial shutdown of service on the North Jersey Coast Line, the Raritan Valley Line and on the Atlantic City Line.
NJ Transit says it will announce detailed contingency plans if necessary next week.
