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(Just idle speculation on my part, as usual)
Maybe the older locos have the Halon fire extinguising cylinders - which do require ventilating before you can go into the room or engine space
Halon is now banned, and nothing else works as well:- not even carbon dioxide. So maybe newer locos dont have anything fitted because there is no similar way of extinguishing electrical fires.
I bet the Swiss have a way. They are bound to be 10x more efficient.
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