If you have been shown how to handle a train journey, how to look for announcement boards, who to ask for help, then you are better able to cope. I am talking generally here, not specifically to this situation.
Recently, taking my GCs swimming, I found a young woman standing in the corridor just outside the women's changing rooms in tears. This is the 'public area', she was in her bikini. She was I guess about 13, taller than me.
I asked her what the problem was and she said she was lost. I asked where she wanted to be and she said 'the pool' which is accessed through the changing rooms. I asked if someone would be there and she said 'my dad, I've never been swimming without my mum before'.
She had obviously not been taught how to ask for directions / help. Her response to a problem was to cry - making her vulnerable (OK not here so much, but another situation possibly).
Of course, I saw her through, and she appeared 'normal' (I mean, not special needs). I didn't labour the point to her dad as the GCs needed seeing to.
Again, I make a general point.