Really, can the high-speed train get off passengers without stopping in the future?

Personally, I think this is difficult to achieve: the high-speed rail runs at 300 kilometers per hour. It takes time and distance for boarding passengers to accelerate from zero to synchronize with the operation of high-speed trains. It is also necessary to change the time and distance of passengers getting off the bus, which must add up to dozens or hundreds of kilometers. Which city can accommodate such a long double-decker railway? Which station can hold such a big platform?