G'day Magnum,

to IIS.
What you are asking for is a dark site to view the sky. Trains will get you North, South and West. It's just a matter of how far.
The Blue Mountains is a great place. But not tonight! The best time is when the Moon is not visible in the sky. If you already knew this, my apology.
Incase you didn't, the best all night period is during the New Moon phase. At this time there a several places around town where you can view the sky with fellow amateur astronomers, and in safety.
In the Blue Mountains, we get together at Katoomba Airfield during the New Moon phase. You will need to get to the Airfield from Medlow Bath train station (next station west from Katoomba), the Airfield is about 4km from the station. Details of this get-together can be found in the Star Parties forum.
If the Airfield isn't viable for you, another option in the Blue Mountains is in Leura. Leura Golf Club is a bit of a hike from the Leura station, but there are very few bright lights glaring down in it. I've taken a scope there a couple of years ago.
The one thing with all train stations is they are all surrounded by bright lights. The trick is to find a dark enough place that is also safe. For this reason, if you don't go to a formal or informal astro gathering, make sure to go with at least one mate.
Mental.