The Pony Express rollercoaster at Knott's Berry Farm is expected to remain closed for an extended period following an incident which saw ten riders suffer minor injuries.
The accident on October 7 saw two of the coaster's trains collide when one train failed to make it over the ride's first hill and rolled back into the other. Nine people on the train that rolled back were injured, while one other who was boarding the waiting train was also hurt. All ten people have since been released from hospital, with none being seriously hurt.
Pony Express is a Zamperla "Motocoaster" which sees riders sitting astride mock horses as they traverse a series of turns and drops (a video of the ride in action is embedded below). The ride, which opened in 2008, features a launched start that propels the trains from 0-38 miles per hour in less than 3 seconds. However, on this occasion the launch failed to achieve the required velocity, leaving the train to roll back into the station.
An investigation into the incident will mean that Pony Express remains closed for the immediate future. As with an accident on Knott's Berry Farm's Xcelerator rollercoaster in 2009, California's Division of Occupational Safety and Health will need to approve any modifications made to Pony Express before it can reopen to the public.