New Jersey commuters faced PATH and NJ Transit delays for the morning commute Thursday into New York City. NJ Transit posted on social media shortly after 7 a.m. warning customers of delays into Penn Station.

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.

Engineers at New Jersey Transit went on strike early Friday, bringing trains on the nation’s third largest commuter rail service to a halt.