HOBOKEN — A U.S. official says investigators estimate a commuter train was traveling 20 to 30 mph when it slammed into a New Jersey rail terminal last week.

That contradicts what the engineer told investigators, who said he believed he was going 10 mph.

The official was briefed on the investigation but wasn't authorized to speak publicly about it and spoke to The Associated Press on the condition of anonymity.

The official says federal investigators are basing the speed estimate on the extent of damage caused by the crash, which killed a woman and injured more than 100 people.

Investigators are working to access a device in the train that records its speed.

The Hoboken station's speed limit is 10 mph, and the engineer told investigators that's how fast the train was going. He also said he had no memory of the crash.

The National Transportation Safety Board is expected to provide an update on the investigation late Tuesday afternoon.