I managed to answer a few things that I had been trying looking up this month.
The maximum tonnage on the majority of the line was 750. This was for 1 loco for memory with 100% power something. It was less in parts due to the gradients in certain parts (Koo Wee Rup, Bena Bank, Tarwin Bridges, Mount Hoddle). The largest load for a freight train was usually around 20 freight cars or possibly more depending the tonnage limit.
The managed to find a 90km/h section on the line. This was section was right near Koala Siding and went for a distance and ended near Nyora. I thought this was unusual becuase the maximum speed for the majority of the line that was in service till 1993 was 80km/h.
When the 4 Tarwin Bridges got to the state that the tonnage had to be limited around the 1980's this also affected the speed limit. I never knew the speed limit of the bridges originally before they were reduced to 15km/h in the 1980's. Almost 20 years after Barry Beach was cut back in 1992 the bridges have decayed to a state with many holes. In a few years time parts bridge deck could possibly fall apart.
The reaming section Beyond Leongatha in 1980's was reduced to a maximum speed of 65km/h. There were a few speed restrictions in a few sections of the track.
Most curves were around 50km/h.
The Tarwin Bridges as I mentioned was 15km/h.
Most the trestle bridges didn't need speed restrictions for memory, but I think around the 90's the ones near Barry Beach Junction did have speed restrictions enforced.
Barry Beach Junction - Barry Beach Oil Marine Terminal had a maximum speed of 35km/h.
For people who don't know this P Class locomotive 18 towing an FSH set ( Four H cars) ran the last Leongatha Pass on Saturday the 24th of July 1993 and departed around 4pm.
I've heard about the Tottenham rail yard clean up and many tankers have been scraped. Is there any more fuel tankers around there and even the state? I'm saying this becuase in the future Barry Beach could possibly be reopened, well I hope.