"I wanna make sure you all know how spaghettified steam trains got when they got too hot and exploded"
ooh ooh ooh! I once picked up a book about steam locomotive explosions on a whim at a library sale!
At the time that kind of thing happened — pretty obviously, when you consider it — they had no idea why. That "got too hot" there is actually very similar to the kind of "stands to reason, innit" explanation they came up with at the time, wherein various official reports (mistakenly) attributed boiler failures to "a sudden development of steam pressure".
The problem is actually metallurgical. High-pressure steam vessels magnify and punishingly expose any problems you have with corrosion inside them. Steam will out, accelerating and forcing through any developing weak points.