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From an engineering perspective it is likely to be mandated that the structure survives 25 years. Where the pieces of track are deemed replaceable. Non replaceable parts will be designed for atleast 50. Fatigue issues in steel start occuring at 2x10^6 load cycles which rollercoasters will start hitting around 25-30 years old. So if we assume 240 operating days a year at 8 hours. In that time lets assume perfect capacity for nemesis of 37.5 dispatches an hour. It would result in a lifespan of 27.7 years. Time to hit 2,000,000 cycles. Colossus - 24y Nemesis Inferno -29y Stealth - 19y Saw - 21y* You can design for more cycles. The eurocodes permit allowances up to 5x10^6 but it requires the stresses in the steel to be low. Saw can probably get away with that hence it not being 8 years. I cant be bothered to work out allowable cycle ranges so for saw I assumed the maximum and the other coasters the minimum. Basically Thorpe park would have an expensive few years coming up if you couldn't extend lifespan in other ways. It would just come down to is it worth extending. Unfortunately for Colossus I think the answer is no.

The planning application has finally been approved and work can now go ahead! https://chessingtonbuzz.com/news/project-amazon-gets-the-go-ahead/

20 million quid? Should have just saved a bit more cash and got a DBGT clone, as that's the future of theme parks.

As if by magic, we have an update, posted by "Theme park Nation" on Facebook. So Inversion is set to open this summer. The park are on a skeletal engineering crew, but their winter maintenance schedule is edging to completion, and the train could be put onto the track next week. What this means is anyone's guess, as painting and commissioning are still big things which need to be done.