First/Only Refreshment Rooms on the NAR?
That's it Guard Class 2! The two trains a week used to stop there for 20 minutes for refreshments. The rooms apparently lasted until well after WWII.
The other notable thing about Adelaide River I would have accepted is that it is the only place on the old NAR that the Alice Springs - Berima line goes anywhere near - it runs though the yard on the old main line alignment. Everywhere else it is some distance away.