The only reason you keep banging on about this issue is because the trainees are women with diverse backgrounds and you have a problem with it. Contrary to your interpretation, the article does not state what the selection criteria actually was, nor does it state that men were deliberately excluded. What it does suggest is that diverse backgrounds are welcome, probably for the purpose of encouraging others.
Not too many years ago I applied for a job at the soon to close Yallourn PS. I have a trade background but no production experience apart from troubleshooting. I asked the HR manager if my role to date was an asset or hindrance and he replied by saying that their best recruit in years was a former deep sea diver! Far more important than previous job description was a demonstrated ability to be receptive to training and to adhere to routine and procedure. What better candidate in the trainee group that we are talking about, than an army major comfortable with a strict compliance to protocol and procedure, with leadership qualities to boot! By the way I declined the job at Yallourn, which turned out to be a smart decision.
If the trainee group consisted wholly of white Christian men with diverse backgrounds, is that discriminatory?
If the trainee group consisted wholly of brown Muslim men with diverse backgrounds, is that discriminatory?
If the trainee group consisted wholly of brown Muslim men with vast rail experience, is that discriminatory?
Training - you say that "Afterall the less V-Line have to teach someone," etc. This is typical short term-ism, crapping in your own nest, shirking your responsibility, etc. Employers cannot simply expect to continually open the cupboard door and find experienced workers just waiting for a job. Someone actually has to train people up. V-Line seem to be doing it now, and you don't like the way they're doing it! The alternative is mass recruitment from overseas where those recruits would be happy to work for peanuts.
The article you linked regarding women in boardrooms etc. is four years old and from some backward country on the other side of the world where inequality rules. Try harder please.
A 1% difference in my superannuation balance compounding over 40 years buys me a new Porsche Cayenne rather than a very second hand Toyota Rav4, for example.