While that looks correct at first glance I'm not sure if the calculation is so simple. You have exactly 1 destination with a plane flight, right ? A to B. But

While that looks correct at first glance I'm not sure if the calculation is so simple. You have exactly 1 destination with a plane flight, right ? A to B. But with a train you have A + all stops along the way + B so if done correctly you could potentially serve a lot more passengers with a single trip than you can with a flight. It could be that monetarily doesn't work out still, but it could be because of an inefficient market. And you should also think in terms outside of just transportation. I imagine plane flights have a centralization effect on where people choose to live while trains allow them to be more spread out.