You may think over the winter when Alton Towers is closed the staff all get a well earned break, but for some of them that's when the work really gets going.
One hundred and fifty full time maintenance workers spend five months inspecting and overhauling all of the rides, to make sure they're set and safe for the season.
Our reporter Chris Halpin went behind the scenes ahead of opening this weekend, to see what they've been getting up to.
- 50,000 bolts on roller coasters checked
- 2000 roller coaster wheels are changed
- 120,000 hours of maintenance takes place
- 150 full time technical staff work on site
- 3 miles of roller coaster track climbed & inspected
Ever wondered how you fix a roller coaster? Well that's exactly what hundreds of staff have been doing since November when Alton Towers shut down for 2014.
And although you think staff might get a break, over the last five months maintenance workers have been very busy.
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The timeline for what has been a stop-start summer for the Smiler.Read the full story ›
A man who says he was a passenger on the Smiler when some of the wheels flew off has told ITV News Central of his "absolute fear".
Kevin Hayes-Heath told ITV News Central that he was in the front row of the carriage and was "bombarded by the fibre bearings which were splitting and breaking up at the highest point of the ride".
An Alton Towers spokesperson has apologised for the ride closure and says an investigation into the incident is ongoing. They say "all of the rides and attractions are expected to meet extremely high standards, technologically, mechanically and in terms of the end experience".
The health and safety of all of our visitors is our absolute priority.
The Smiler ride was closed yesterday afternoon when some of its small plastic guide wheels became detached. Most were caught in the netting below the train but several hit passengers on the front row of the train.
Two were treated by park staff and all four people stayed at the park for the rest of the afternoon.
The park says:
As you would expect from the UK's most famous Theme Park, all of the rides and attractions are expected to meet extremely high standards, technologically, mechanically and in terms of the end experience and a full investigation is now on-going to determine when the ride can re-open.
We are of course very sorry for any disappointment the ride's temporary closure is causing but the health and safety of all of our visitors is our absolute priority.
The Smiler ride at Alton Towers is closed after some of its wheels came off yesterday afternoon.
Several people at the front of the train were hit by the wheels.
The park says a full investigation is now going on to work out when the ride can reopen.
A new 'land' is to open at Alton Towers in Staffordshire next year.
Opening in May, the five-acre CBeebies Land will have live characters and shows for pre-school aged children.
Alton Towers in Staffordshire has been forced to close its Smiler ride after reports that a bolt was seen to have dropped from the ride. Watch the rollercoaster in full swing before it was closed.