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I have been checking through my books and magazines and it appears that some of the newer electric locos operating in Switzerland are fitted with heat detectors as opposed to smoke detectors.
Obviously the loco in my story must have had more than a heat detector for it to have been affected by the steam loco's smoke. Although it was a Swiss owned loco it was also equipped and certified for use in Italy where the fire regulations are much stricter so perhaps the fire-detection system was more sensitive than a loco only fitted with Swiss equipment?
The loco manufacturers don't name the actual firefighting material but it seems to be based on nitrogen/argon/carbon dioxide.
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