I remember seeing a video (or maybe pictures) of that nature when I was a teenager, maybe 20 years ago. I think that if the Japanese had the technical capacity to add trains (which already run every 2 minutes), they would have added them a long time ago, as the system is very well used. Apparently it's actually getting a bit better because... the birth rate is lower.
I don't think there are very easy solutions for the individuals involved. Living in North America, it's easy to take our extremely low population density for granted, but that's not how the majority of the world lives!
That is insanity! How can they run something like that! You would think there would be fire laws or something. I was in Japan years ago and rode the subway there and do not remember it being that bad but it was stuffed.
Blessed are the flexible, for they shall not be bent out of shape.
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