KANSAS CITY, Mo. (AP) _ A train on an amusement park roller coaster struck the rear of a stopped train Sunday, injuring nine people, including three who were stranded 40 feet above ground for 2 1/2 hours, authorities said.

The train that was struck was stopped at the loading station, said Sherry Schmitt, a spokeswoman for the Worlds of Fun amusement park. Each train was carrying about 25 people in seven cars.

All of the injuries in the 5 p.m. accident on the Orient Express occurred in the moving train, Ms. Schmitt said, adding that firefighters used elevated baskets and ladders to lift all but three of the victims in the second train to safety.

''The last three in the back couldn't be removed right away because of fears of back injuries,'' Ms. Schmitt said.

The injured were taken to North Kansas City Hospital ''as a precautionary measure for treatment of whiplash,'' she said.

Eight had been treated and released by late Sunday night, Ms. Schmitt said, adding that she did not know if the ninth person would be admitted.

The cause of the accident, which damaged the fiberglass shell of some of the cars were damaged, was not known.

The roller coaster, which stands 260 feet above ground, has been in operation since 1980, Ms. Schmitt said.