Disney is a corporation like any other, Their management is like most management teams where managers are promoted on the basis of connections and social intelligence rather than technical skill.
So if the manufacturer 'recommends' a part be changed every 2000 hours yet there is no LAW saying they must. They will look at the part and it LOOKS perfectly good so management will stretch the interval first to 2500 hours then 3000 then longer still. After all that 2000 hours is just a recommendation right?.
They are not evil just people who are making decisions on a financial basis because its the only thing they understand. And they don't trust the people who are paid to understand these things because they are geeks and nerds. The Animal House social hierarchy is very much alive at most American companies.
The ultimate expression of this kind of uninformed thinking was the Challenger Disaster where the shuttle was launched after a lenghty 'cold soak' so the O-rings were below the temperature they needed to be at to seal the SRB's. The engineers as a body said hell no we are below spec. Managers said get stuffed engineers this looks bad for NASA and we are go for launch. History records the result of that decision.
I can't speak for every ride, but I know on expedition Everest, each train had a tracker on it that would count every single lap it made every single day. The program was up on a flat screen TV and you could sit there and watch each train's lap number increase one by one all day long. There was a maximum number of laps each train could take (I don't remember what it is now, but it is a defined number), and the train with the highest count was usually the spare left in the barn. Once it got within close range of the target number, the train would be totally removed and sent to central shops where it was taken apart and entirely rebuilt.
And the other cool thing, IF the train ever reached that target number, the computer would NOT let that train be added to the track. It was literally impossible.
So for some rides, Disney really CAN'T go over certain amount of wear.
ETA: now that I think about it, most attractions I worked had this - I know it was on Splash and Kali as well as a few others, I just didn't go in other barns as much as Everest. But the system is called AMVS, and I totally forgot what it stands for, but it's what tracks every single vehicle.
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