New Jersey and New York City commuters are facing extensive delays in and out of New York Penn Station Friday, with intensifying ripple effects, after an Amtrak work train car on one of the hub’s tracks caught fire.The FDNY says it was called to the scene on 31st Street, between Seventh and Eighth avenues, around 1:30 a.m. Nearly 100 personnel responded. Five civilians were evaluated at the scene by EMS, officials say.It’s not clear what sparked the fire involving Amtrak’s contractor maintenance vehicles in one of the Hudson River Tunnels. It was knocked down well before 6 a.m., but service on New Jersey Transit, Amtrak, Long Island Rail Road and more was expected to see heavy effects well into the morning rush, with Hudson River trains operating at reduced capacity. Amtrak said it didn’t expect to lift its suspension until at least noon.New Jersey Transit and LIRR also announced delays and cancellations. Cross-honoring and diversion programs were in effect as the situation developed. Complete LIRR service at NY Penn had resumed by around 7 a.m, though equipment issues were causing cancellations. Video from outside Penn Station showed smoke billowing in the pre-dawn hours, as emergency personnel stood by with stretchers awaiting any potential victims.Amtrak is investigating the cause of the fire.“We sincerely apologize for the inconvenience this may cause,” the agency’s latest announcement said, pledging to provide updates as new information becomes available.