It happened just before 8:30 p.m.
Service operated on the Ronkonkoma Branch Friday morning, but only on one of two tracks as the railroad repairs track damage.
Full restoration of the Ronkonkoma line is expected by 11 a.m.
The crash caused extensive damage to the train's infrastructure and the third rail.
The train was going 75 to 80 mph at the time of the collision, the speed limit at the location is 80 mph.
----------
* More Long Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube