Wake In Fright - Tiboonda
I've just read in Australian Railway History that the real name of Tiboonda was Horse Lake.
It was a filling point for the Emergency Water Trains that supplied Broken Hill.
It explains the removed and decommissioned Y shaped Siding that appears in the opening shots.
Trains entered the Broken Hill side Arm of the Y and were filled with Water there.
They then continued into the Base of the Y and were then shunted back onto the main line via the Menindie side Arm of the Y and returned to Broken Hill with the Engine at the front of the Cars.