Oradell police and firefighters responded along with a PSE&G crew at the railroad crossing next to the train station after the 16-inch main cracked shortly after noontime, Sgt. David Gangemi said.
No injuries or evacuations were immediately reported.
The situation was under control, but police said the road would remain closed for several hours while firefighters remained on standby.
Click here to follow Daily Voice West Milford and receive free news updates.