NJ Transit rail engineers are on strike. Here is what you need to know.

NJ Transit engineers walked off the job Friday, disrupting an estimated 350,000 commuters’ daily travel plans in New Jersey and New York.

» READ MORE: NJ Transit train lines suspended after rail engineers go on strike

The strike went into effect at 12:01 a.m. Friday, stopping all service for NJ Transit commuter trains. The agency runs an estimated 1 million weekday trips on its buses and rails, and includes service to destinations such as Philadelphia and New York City.

At issue in negotiations between the Brotherhood of Locomotive Engineers and Trainmen and NJ Transit are member engineers’ wages. Members, the union says, earn an annual average of $113,000 and want to see that figure increase to $170,000. NJ Transit officials, however, claim engineers earn $135,000 on average, with some having a salary as high as $200,000.

Tom Haas, general chairman of the Brotherhood of Locomotive Engineers and Trainmen, said at a news conference last week that the union was seeking “nothing more than equal pay for equal work” — an ask that has been “continually rebuffed by NJ Transit.”

“NJ Transit engineers want to keep the trains moving, but the simple fact is that trains do not run without engineers,” Haas said.

Here is what you need to know:

NJ Transit riders in the Philadelphia area could see some impacts, but they are likely to be minimal. NJ Transit’s bus routes, the agency’s predominant lines in the region, would not be impacted by the strike, officials have said.

Some rail lines that may be used by riders in the area, however, would be impacted. Those include the Atlantic City Rail Line and the Northeast Corridor Rail Line, both of which have alternative routes in place, NJ Transit indicated on its website. For the most part, this includes the use of NJ Transit buses, or SEPTA and Amtrak trains if you are traveling from 30th Street Station.

Other NJ Transit services, including the Newark Light Rail, Hudson-Bergen Light Rail, and River Line, are slated to run on regular weekday schedules amid any strike, the agency has said. NJ Transit Access Link would also run on its usual schedule, but officials have indicated that longer travel times should be expected.

Additionally, PATCO service, which runs between Philadelphia and Camden County, would not be impacted. PATCO employees are represented by different unions.

Getting to and from New York City via NJ Transit trains is where it could get a little complicated. Amtrak or a private carrier bus may be your best options to get to Penn Station, but as NJ Transit noted online, passes for its services won’t be honored by other carriers.

Due to the strike, NJ Transit has said that it would increase service on existing bus routes that are near rail stations for New York commuters, and would work with private carriers to set up buses from several regional park-and-ride locations during the week.

The agency has said that even with that “very limited” additional capacity, it would not be able to meet travelers’ demands.

NJ Transit indicated online that its contingency plans are focused on the roughly 70,000 New York-bound customers it regularly services. Plans for continuing travel during a strike, it said, would carry only about 20% of its current rail customers, as its bus system can’t “replace the railroad.”

To that end, chartered buses will run from four satellite lots in New Jersey to the Port Authority Bus Terminal in Manhattan or to PATH train stations in North Jersey. Those lots are Secaucus Junction, the PNC Bank Arts Center in Holmdel, Hamilton Rail Station, and Woodbridge Center Mall.

Additional information about impacted routes and alternative travel plans is available on the NJ Transit website.

This article includes information from the Associated Press.