I understand the system very well :). But you could be doing 88 per hour on the 456 or ACE if you had modern signalling. 22tph/track is really poor. If you com

I understand the system very well :). But you could be doing 88 per hour on the 456 or ACE if you had modern signalling. 22tph/track is really poor. If you combined that with walk through trains you could easily get a 200-300% capacity increase. There is a lot of theoretically low hanging fruit on the MTA, technically speaking. Keep in mind how screwed cities like london are which do have the theoretical max per track and no other option but to build new subways. NY doesn't have this problem, it just needs to use its assets way better and there is room for at least a decade or two of further growth.