Nicholas Stein is accused of punching and dragging an inmate.

Thursday’s decision shows new caution among rangers a week after a rabid fox attacked a visitor and her young son.

Investigators hope the electronic data from the Amtrak train and tractor-trailer that collided Monday will provide clues about what caused the fatal crash on Route 4 in North Berwick.

Amtrak authorities recovered recorded data from the locomotive that should reveal its speed leading up to and immediately after the crash. The train typically runs at 70 mph through the at-grade intersections in North Berwick, officials said, and the gates are designed to close at least 20 seconds before the train arrives.

State police are trying to determine why the trash-hauling truck failed to stop before the gates and skidded into the path of the train. The collision sparked a huge fireball and killed the truck driver, Peter Barnum, 35, of Farmington, N.H.