When looking over the timetables for Japan Rail, what always struck me was that trips tended to top out at 6 hours, regardless of speedhttps://twitter.com/380kmh/status/919252082720460800 …
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Overnight buses in Japan compete by price--they are *way* cheaper than equivalent trips by train (and occasionally faster bc of route!)
So do many cheap airlines. But I believe there would be a market for overnight trains (even in Japan). It depends on politics partially.
But if they are implemented well they also can offer some advantage in comfort. No airline queues, get up later, get off in city center, ...
I think the comfort factor is a gimme, where they routinely fail to compete is cost
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