Considering that he only would spend a very small proportion of his year on any trains or inspection tours (I’m guessing this), it’s far more likely he died in his residence or in a hospital room.
Of course, since he was in such serious ill health any attempt at a train ride or inspection tour might have been the added stress that brought a cardiac crisis.
Still, I’m guessing the train thing is a propaganda fabrication to make him sound active and energetic in service to the cause to the last moment..... bc otherwise ppl might become more aware that he spent his days and nights in a cesspool of luxury and sensuality and depravity.
This sounds more plausible by the minute. And if Western news sources had any sobriety, they would preface it with “North Korean authorities insist” (Kim died on a train). Rather than reporting it as straight news fact. We cannot do that at this time. Too many questions. Too many lies to-date.