That if you don't want to travel on the Caledonian sleeper, given their policies then don't. Or any other entirely discretionary travel.
Women only spaces are as much a demand as allowing trans-whoever into those spaces. That there are competing rights. And that I just don't believe the vast majority of people transitioning are doing it to invade, bully and threaten. Just as most gay couples, if they dare to display affectionate behaviour to each other in public, are not trying to 'flaunt it', or inveigle others in to the 'homosexual lifestyle'. They're probably just trying to live their lives in a way that makes sense and has integrity to themselves.
The anecdote, by the way, was a case where my fears and perceptions turned out to be my own mindset, not the actions of others.
And that is said as someone who has been the target of sexual violence, before anyone starts with the 'you couldn't possibly understand'...