The Smiler is a steel roller coaster located at Alton Towers in Staffordshire, United Kingdom. Manufactured by Gerstlauer, it features 14 inversions and holds the world record for most inversions on a roller coaster. The Smiler has suffered a series of setbacks and ride incidents including a malfunction at a press preview event which delayed the official opening date to 31 May 2013. On 2 June 2015, two of the ride's trains collided leaving five riders seriously injured. An investigation by the HSE was initiated, and the ride was closed for the remainder of the season. The ride eventually reopened on 19 March 2016 with revamped safety standards.