(UPDATE 3:30 p.m.)
New York Gov. Andrew Cuomo said Sunday that initial reviews indicate that the yellow maintenance train somehow entered the clearance space of the passenger train, causing it to derail and leaving a "splatter of paint where the first collision occurred."
Cuomo added that the National Transportation Safety Board is continuing its investigation.
The Associated Press contributed to this update.
Just weeks after a train crash killed one person and injured more than 100 in New Jersey, another train derailed east of New York City, injuring dozens of people.
The Long Island Rail Road train, heading east, derailed near New Hyde Park at about 9 p.m. Saturday. Eleven people were hospitalized, all with apparently non-life-threatening injuries, Gov. Andrew Cuomo said. Official estimates on the number of injuries, mostly minor, varied from 29 to 40.
We knew we hit something but we didn't know how bad it was.
Metropolitan Transportation Authority chairman Thomas Prendergast said the front car sideswiped a work train, derailing the second and third cars of the passenger train.
Here's a look at the devastation.
Long Island Rail Road trains have been involved in 72 accidents since 2011, according to federal data, including three collisions and 15 derailments on tracks used for passenger service.
The accidents killed five people in vehicles that wound up on the tracks and caused 30 injuries and nearly $10 million in damage to train tracks and equipment.
The Associated Press contributed to this report.