I've been in QR for 19 years, and been a driver for 5. At one point, my depot (Cloncurry) had 10 women staff, being 6 drivers and 4 Rail Operators (Shunters). I worked will all of them at one time or another, and I would say that they were an absolute pleasure to work with, and I have no misgivings about women being drivers or shunters in general. (poss, not calling you a liar, I'm not doubting that you've had a different experience. Just saying how I saw things from my viewpoint.)
And just to add things to the mix, my sister is a qualified auto electrician. , so I have no "Girls can't drive trains/work with machinery" views.
As for these positions: In all likelihood - trainee driver positions are nearly *always* over-subscribed - there will be more than enough fully competent women who can fill the 10 vacancies. In that case, no problems.
My ONLY concern would be in the (unlikely, but possible) event that there were NOT enough competent women to fill the vacancies, and that the order comes down from All High to fill the vacancies regardless, so that some boss doesn't get their ar$e kicked. That would be the only thing I would query in these specific vacancies...