Looking at the picture in the current thread " Oops ! " reminds me that back in the day many engines had home made safety valve bonnets . Some were quite neat and workmanlike , some less so , but they all served a purpose . My own engine has no roof at all , but steam from the safeties is sometimes a real nuisance , and is sometimes frankly dangerous because one cannot see ahead . Yes , I know that some perfect persons would manage their boilers so expertly that such a thing would NEVER happen to them , but the rest of us do get caught out .
So , why not make your own , a legit chance to show a bit of craft and imagination , owt's better than nowt .
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