Footage from Alton Towers theme park in Alton, UK of the tragedy-stricken 'Smiler' ride being tested using crash test dummies late last month.

Four people were injured when the rollercoaster crashed in June - with two losing their legs. Alton Towers bosses have reportedly made the controversial decision to re-open the ride at some point and it has been seen being tested while empty and with dummies.

The filmer wrote online that "at times there were two cars on track at the same time" when they witnessed the tests.