As someone who commutes and often travels via train, I feel I must speak. Much like a certain human orifice, the train doorway is not meant for simultaneous entry and exit.
When a large group of people need to exit the train to create the room for new passengers to enter, you should let them exit. It is the most efficient, most polite, and most appropriate approach. And yes, politeness matters.
In fact it’s in your best interest to also ensure there is a path for them to get clear of the train entirely if you actually want to get on. It’s also in the best interest of our society and mankind, and I know that Politenessman would agree.
The idiocy of a few (or just one), causes a problem at every station, numerous times everyday. Polite people colliding and stuck as they try to get out, because one inconsiderate idiot has to get on immediately. Since I no longer have my Politenessman steel hanky to inflict appropriate justice to the worst offenders, I vow to continue to serve as an example to all – a forceful example in fact.
I get to the front of the crowd, spread my arms wide and pivot as the doors open, so as to act as human windshield wiper and both clear a proper exit path, and prevent the rude and the uneducated from entering until all have exited.
Now, back to the aforementioned orifice; anyone who’s tried to simultaneously to ingest water while either sneezing or vomiting can attest to it just not working. -Of course that’s what orafice you were thinking of too, right?
Politenessman knows (and you may have a steel hanky coming your way if you don’t clean up your act).