How to board a train that never stops?
Answer: You enter a capsule that is dropped on top of the train as it enters the station, while another capsule that was previously on top of it stops at the station. Check a YouTube video
for details. Presumably, such a train would be more energy efficient than one that has to stop at every station. It reminds me of Arthur C. Clarke’s idea (in “Profiles of the future
”) of having running strips as public transportation. One enters an outermost strip which runs at a low speed and proceeds to inner strips that become increasingly faster. [Source: Der Spiegel