Technology
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Maglev, they hold the current rail speed record with 603 km/h: https://en.m.wikipedia.org/wiki/Railway_speed_record
By comparison the cruising speed of a current airliner is ~900 km/h
Maglev is expensive both to build (because you need magnetized rails) and to operate (uses more energy overall than a shinkansen).
There is a reason why Japan built a prototype decades ago but never built a commercial line.