Just reread the whole chain. I have several thoughts, but will not put them all in one post.
Duration of time doors are open: After quite a few years in Asia and being a regular rider of Metros in Taipei and Hong Kong and lesser times in Singapore in Japan I went to San Francisco and became a semi regular rider of BART. From my first trip on BART after getting on, my thought was, "OK, we are all on, not close the doors already." For no discernable reason it seems the door open time on BART was somewhere over twice the norm in Asia. Cannot comment on door open times on transit in the Northeast, since I was last there before regularly riding metros in Asia, and have not been back in the Northeast since returning from Asia, and probably won't be in that part of the country ever again. Asto the door open time on Amtrak: In the high platform areas, ALL doors should be opened at ALL stops. There is no real need for them to have an attendant. For the low platform stations, the time saved by having more people to have more doors open would be well worth it, and announcing stations and door positions in advance should be a no-brainer. This is a management issue.