That’s right, they all did.
The last steam systems were installed before World War II, and the men who installed them, serviced them, designed them, and understood them died a long time ago. Because steam systems are essentially bulletproof, there’s still hundreds of thousands of steam systems around. But owing to the fact that it is no longer installed, future tradesmen lost all interest in learning and understanding it: Steam is dead. Long live the future! Not surprising then that the systems became neglected and -much worse- inappropriately altered. Steam is pretty simple, but it has ironclad rules for how it must be piped and operated. And when those rules are violated (and who is left to know what they are?) steam rebels.