ANAHEIM

A woman was injured Sunday night in a fall from a train at Disneyland, triggering a police investigation under new procedures stemming from a December accident that killed a tourist, authorities said Monday. The 55-year-old Moreno Valley woman was trying to recover a dropped backpack when “she lost her balance and fell onto the train right-of-way,” said Sgt. Joe Vargas, a police spokesman.

Complaining of arm, neck and back pain, the woman was taken to Western Medical Center-Anaheim, where she was treated and released. Vargas said an officer stationed at the park interviewed her family, the train engineer and other witnesses.

The park and the Police Department were criticized for their handling of a Christmas Eve accident that killed a Duvall, Wash., man and seriously injured his wife and a park worker. Disney employees quickly removed all evidence and mopped up the accident scene, a dock that investigators didn’t reach for hours afterward. The department later agreed to station an officer at the park and to quickly investigate serious crimes and accidents. Sunday’s incident “is the type . . . we probably never would have responded to” before the change in policy, Vargas said.