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Rutschebanen at Tivoli Gardens, Copenhagen, which I believe is currently the second-oldest operating #rollercoaster in the world, opened 1914.

This is a side-friction coaster, which means it has no upstop wheels holding it vertically to the track (one of the first to have them was Jack Rabbit at Seabreeze which I rode earlier this year), and this one also has a brake operator who rides on a jump seat in the middle of the train.

It's a good ride that actually gives little pops of airtime on some of the drops, remarkably given the mechanics of it (aside from the train having no upstop wheels, the brake operator basically has no restraint either, so obviously it couldn't give too much). I love the old-school rockwork and many dark tunnels too.

Is there any reason *not* to go to Dorney Park and ride the roller coasters in an attempt to get my kidney stone to pass?

The actual study, where researchers took a model of a kidney on roller coasters and fed kidney stones through it:
degruyterbrill.com/document/do

News article about the study:
sciencenews.org/article/riding

I could ask my urologist, but I bet he'll say "no" and I guess if I have to hear "no" I'd rather hear it from fedi.

De Gruyter Brill · Validation of a Functional Pyelocalyceal Renal Model for the Evaluation of Renal Calculi Passage While Riding a Roller CoasterContext: The identification and evaluation of activities capable of dislodging calyceal renal calculi require a patient surrogate or validated functional pyelocalyceal renal model. Objective: To evaluate roller coaster facilitation of calyceal renal calculi passage using a functional pyelocalyceal renal model. Methods: A previously described adult ureteroscopy and renoscopy simulator (Ideal Anatomic) was modified and remolded to function as a patient surrogate. Three renal calculi of different sizes from the patient who provided the original computed tomographic urograph on which the simulator was based were used. The renal calculi were suspended in urine in the model and taken for 20 rides on the Big Thunder Mountain Railroad roller coaster at Walt Disney World in Orlando, Florida. The roller coaster rides were analyzed using variables of renal calculi volume, calyceal location, model position on the roller coaster, and renal calculi passage. Results: Sixty renal calculi rides were analyzed. Independent of renal calculi volume and calyceal location, front seating on the roller coaster resulted in a passage rate of 4 of 24. Independent of renal calculi volume and calyceal location, rear seating on the roller coaster resulted in a passage rate of 23 of 36. Independent of renal calculi volume in rear seating, calyceal location differed in passage rates, with an upper calyceal calculi passage rate of 100%; a middle calyceal passage rate of 55.6%; and a lower calyceal passage rate of 40.0%. Conclusion: The functional pyelocalyceal renal model serves as a functional patient surrogate to evaluate activities that facilitate calyceal renal calculi passage. The rear seating position on the roller coaster led to the most renal calculi passages.

Tour of the nascent National Roller Coaster Museum in Texas:

youtube.com/watch?v=1uM2bE4IGGM

Lots of memories here--they've got pieces of most of the defunct coasters I've ridden and a couple of still-running ones. They claim to want to turn one of the Canobie Corkscrew's inversions into an entrance arch.

For what it's worth, the comments are full of people expressing skepticism that this place will ever really publicly open. But apparently they do hold periodic events at which you can tour the collection.

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