A Disneyland roller coaster-type train that plowed into a parked train Sunday, injuring nine people, was sent down the wrong track because of a computer “mistake,” park spokesman Bob Roth said. The electronically operated Thunder Mountain Railroad train, traveling between 3 m.p.h. and 5 m.p.h., collided with an out-of-service train at the station, tipped sideways, throwing passengers into horizontal safety railings, Roth said. All nine suffered mostly bruises and were treated and released, Roth said. Tracks flank both sides of the station, north and south, and trains are switched electronically to one or the other. Due to a “mechanical mistake,” Roth said, the last train was switched to the north track unloading area, where it rear-ended the empty train.