It's not awful if you'd need to build new rail links into the city centre anyway (e.g., due to capacity) and you have little onward long-distance travel. Tokyo–

It's not awful if you'd need to build new rail links into the city centre anyway (e.g., due to capacity) and you have little onward long-distance travel. Tokyo–Osaka may well be a viable route for that, but there certainly aren't many. (In the Shanghai case it's practically laughable, because it's such a short journey the top speed is practically irrelevant: it spends half its time accelerating/braking)