I've had one go off a couple of times while in the toilet and nothing was burning and I heard nothing from the driver. I've even heard them go off when there was nobody in the toilet. So I would guess that nuisance alarms have reduced the effectiveness to the point where drivers just reflexively dismiss them. But the 29Ks mustn't have an alarm given how regularly I see people smoking in toilets there.
Surely this is a bit dangerous as if there was actually a fire in a toilet nothing would be done about it until it had caught hold and a passenger noticed it and pulled the cord or whatever it is nowadays. Perhaps they are hoping that a passenger will intervene with a fire extinguisher rather than actually provide staff to do anything about potential emergencies.
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