11-29-2020, 09:58 PM
(11-29-2020, 09:45 PM)ijmorlan Wrote: This is not the first time I have heard of clearly wrong design related to doors. My understanding is that some subway trains, I think including the TTC’s Toronto Rockets, have the following procedure when an obstruction prevents a door from closing: all doors re-open and repeat the closing sequence. If they fail 3 times, the train is out of service. This is totally absurd. What should happen is that only the obstructed door should re-open. This means instead of requiring 24 doors to successfully close simultaneously, maybe 23 close on the first try and the remaining one re-opens and then closes. So right away this would eliminate most of the problems.
This is the way every urban train (that I can think of) works: all the doors open and close in unison. One won't close? All doors will reopen and attempt to close again.
I am not an expert in this, though, so I don't know why this logic is used.