NJ Transit engineers are preparing to walk off the job on Friday, which could affect 350,000 commuters in New Jersey and New York City.

If the engineers do walk off the job, the agency plans to increase bus service, saying it would add “very limited” capacity to existing New York commuter bus routes in close proximity to rail stations and will contract with private carriers to operate bus service from key regional park-and-ride locations during weekday peak periods.

Beyonce is scheduled to play five dates at the stadium between May 22 and May 29. But NJ Transit spokesperson John Chartier on Tuesday did not know if the 50,000 people who can fit into the venue for a concert will be able to take mass transit to the shows. “Meadowlands service for the Beyonce concert remains TBD,” said Chartier.

Some 350,000 commuters could soon be scrambling for other ways to reach their destinations if New Jersey Transit engineers walk off the job early Friday