You all need to revise your anatomy textbooks.
The opening act was On Her Vajesty’s Secret Cervix.
I laughed out loud at that one.
To the tune of Kenny Rogers’ “The Gambler.”
On a warm summer’s night on a train bound for nowhere
I was chatting with a lady who was much too drunk to sleep
So we took turns a-starin’ at the speed gauge on the steam car
When the engine got to 60 the lady began to freak
She said, “Man, I wore my hoop skirt out of custom and tradition
And knowin’ that a petticoat would make the lines look sleek
So if you don’t mind me askin, well, my womb flew out the window
And if you could just retrieve it, then I mightn’t feel so weak.”
Yes, @Riemann, that was awesome. Two thumbs up!!
ETA: @DavidNRockies. That was great too!
We’re really on a roll here. Speaking of rolls …
I mentioned in another thread recently seeing an episode of an old TV series that included an all-girl rock’n’roll band as one of the plot elements. The Rough Sects were dressed sorta Goth-sexy plus crucifixes.
I think maybe those gals might have been able to prolapse a uterus at any speed. They certainly acted like they liked their sects fast and violent.
To give credit for my plagiarism, it was the name of a WWE wrestler in Family Guy.
Rejected early idea for Mac screensaver.
There were a ton of misconceptions about women’s anatomy. A lot of them related to exercise. The first time women were allowed to compete in a marathon in the Olympics was 1984, fercrissakes, because that long a race might damage their fertility.
As Larry the Cable Guy might have said:
Now that’s funny!
Ok, I actually mentally visualized that, complete with “Ride of the Valkyries” playing on a tiny speaker.
I think it was the Flying Karamazov Brothers.
I’m trying to remember where I heard that, because they couldn’t dissect humans, the drawings in ancient/medieval anatomies were of pig uteri. (uteruses?)
You think we still don’t have these beliefs. Just today I read an article in the Times about a woman who was told 21 years ago that her extreme nausea of pregnancy was all in her head and a play for sympathy. Here is a link:https://www.nytimes.com/2023/03/14/well/marlena-fejzo-hyperemesis-gravidarum.html?unlocked_article_code=ElERg6P-vy7dDaJPc2VIpMKtSDdfqUz97gwTl31lxrkGZpJQ4FoVfe5XyUeFIQzaUc_vYGBNE2kvtAoSACiAh0j7QN2sJiVU8Jcak530j9DgvRRzjplmy44A0cMaIiNIeI7PqXgXS2ApQNfEgwYyjrPQOCAcCbXxMWJpwNKCnJxfcnGeCA63SeSiOa26fRDjVqRC_h-7U8ythUlUflnDXqP-cL9s98aHKgNqc7pLehD_f872GGEzk2XrkzVYbrGXsxln3vzk6_yVNVogr65IhdjivWjvaq9iam0hhjPm_fkSOVGIc6rfAtU6n8bFmkDe-KvRM0HxNB3i55zH8BFDl0Kkw5UzM_3e-sA5&smid=url-share
One paragraph from the article:
`“My doctor pretty much thought it was all in my head,” Dr. Fejzo said. He told her that women make themselves sick during pregnancy to gain the sympathy of their husbands, and later, that her illness was a ploy for attention from her parents, who were helping with her medical care.’
Here’s a link to a medical journal article from February, 1870. (Page 70-71)
I don’t see a reference to speed, however.
(I may find one regarding speed, but I don’t think that the OP’s claim of uteruses “flying out of the body” was a thing. Rather, the fear was that it would move out of position within the body).
It was not just women that it was claimed would be harmed by travel in fast-moving trains. The same was true of men. It was claimed that they would become insane during the time of travel.
60mph in a train may have been safe. But up at more like 600mph in a passenger jet I’ve certainly seen plenty of insanity from men (and a very few women) who had seemed like decent folks on the ground. 
I remember reading somewhere that predictions of not being able to breathe at train speeds were also common, FWIW. And yeah, for the uninitiated, uterine prolapse is a real and eye-catching thing. I would even go so far as to suggest that with the right acceleration and axis of momentum, you could induce it.
Intelligent design my ass, heh, heh, rectal prolapse is also a thing.
On the Atchison, Topeka & The Centrifuge!
There were also theories which held that it was caused by education: blood going to the brain that should be devoted to menses.
It is good to see that, in these enlightened times, no one has referred to this as an old wives tale.
It was an eternity in there.
There were a number of bizarre notions about the results of high speed travel, such as in Jules Verne’s Master of the World:
“Master of the World contains a number of scientific ideas, current to Verne’s time, which are now widely known to be errors. For example, traveling at high speed does not reduce a vehicle’s weight.”
I’m not clearly recalling if it was the book or some other that described vehicles traveling at 100MPH or possibly less were still too fast to be clearly seen.