Two of the four were taken to a hospital. All 22 passengers had been rescued by Monday night. It took more than two and a half hours to remove all the stranded passengers from the coaster. “The 25 guests on the train were all alert and corresponding with park personnel during the evacuation process,” park spokeswoman Sue Carpenter The accident was caused by a tree branch on the track, he said. The ride will remain closed while inspectors survey the track and the area. The Ninja opened in 1998 and has a top speed of 55 miles per hour. According to the Themed Entertainment Association, Magic Mountain is ranking 18th among North American theme parks in terms of attendance with 2.9 million visitors in 2013, Between 1990 and 2010, more than 92,000 children were injured in amusement ride-related incidents, according to a study by the Center for Injury Research and Policy at Nationwide Children’s Hospital in Ohio.