B trains are running regularly again after a track fire on the Manhattan Bridge led to a service suspension and then severe delays along the line Monday morning, the MTA said.

The track fire broke out just before 8 a.m., the FDNY said, causing the MTA to suspend B train service in both directions as firefighters worked to extinguish the flames.

By 10 a.m., B train service had resumed with “severe delays” in both directions, according to the MTA. Full B train service had resumed by early Monday afternoon, the agency said.

N, Q, R and W trains were also temporarily running with “severe delays” due to the fire. 

The FDNY said no one was injured by the fire, and it wasn't immediately clear how it began.