Comment by markasoftware
7 days ago
I wonder if it's possible to run trains at higher speeds closer to each other using fixed brakes embedded near the tracks, similarly to how roller coasters often have mid-course brake runs that are only activated in emergencies when the train ahead unexpectedly slows or stops.
Roller coasters accelerate and brake much harder, which is fun for the restrained passengers but not for commuters.
Signaling systems used on automated trains know the position, speed and capabilities of every train. Keeping a safe distance behind isn't a problem.
We're at the point where we could easily fit so large a fraction of the rail length covered/overshadowed by the train with https://en.wikipedia.org/wiki/Track_brake that we could pull around 4 G deceleration if we cover the bottom in that brake chains (chain strong; chain flexy enough to just wiggle over humps in the track).
What works for a strapped in amusement park rider doesn’t work for the standing commuter holding a cup of coffee.
Trains have the capability to accelerate and decelerate faster, we mostly don’t do so for comfort and safety reasons.