Back in the early days of boilers there was a few cases of safety valves being screwed down to increase boiler pressure. A few of these incidents are covered in the excellent Red For Danger by L T C Rolt. From memory I think one actually mentions some poor unfortunate chap who screwed down the valve and when the boiler exploded it took the individual with it although he was nowhere near the loco itself.
I can see where the author got the idea from but I am unaware of the book.
Cheers John
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