the limiting factor is that shafts havr to accommodate bidirectional movement and using a rope only allows 1 per shaft. you can solve this by having the cars o

the limiting factor is that shafts havr to accommodate bidirectional movement and using a rope only allows 1 per shaft. you can solve this by having the cars on rails and having unidirectional shafts where the cars only travel horizontally at top and bottom. this would allow muliple elevators per shaft.