Helpful,
You are reading something into the teshuva that is not there. R’ Moshe did not say that you should stand if there are no seats; R’ Moshe did not say to find a different way to work; R’ Moshe did not say to change your work hours to avoid the crowded train. He said that a man sitting next to a woman is only ossur for those who have a psychological problem.
Thanks again to Ben Torah for posting the teshuva that clearly and unambiguously states that normal men with normal yetzer haras may sit next to women.