T613,
What are you talking about? I have had the occasion to be on a minyan bus on more than one occasion as well as when there was no davening on the same bus line. The women are not at the back of the bus at all. (Unless they walk there themselves).
In fact, from my experience it is clear that almost no one commenting here has been on the minyan busses. And that the poor attitude described by anon1 is his own.