i remember seeing an example simulation 6 months ago out of europe where they were using high speed rail with feeder cars that would pull up alongside the main

i remember seeing an example simulation 6 months ago out of europe where they were using high speed rail with feeder cars that would pull up alongside the main fast train to let people on/off, without slowing down the main train. this was thought up to speed train travel as the acceleration/deceleration of maglev trains contribute to their energy and time delays.