Just to Clarify Yes, plus the Yallourn line
The Gippsland Line used to Be electrified to Traralgon because it had a locomotive depot. you can still see the cantery stuff on the overhead bridges and beside the line
The Hazelwood line was electrified
Morwell had several branch lines running off it, but they were not electrified.
2002 (The last briquettes were railed to Dennington In Feb 2002)
The briquette freight line closed in 2000/1 but part of it is used as a siding and you can access it up until the highway overpass.
Was a 900 mm gauge line that ran from Morwell power station to Yallourn raw coal bunker and workshops (there was a conveyor belt linking the rail outloader/loader at Morwell power station to Hazelwood power station)
the ICR is a seperate line running from Hazelwood Power Station to Yallourn.
Just to clarify and add to the discussion thus far:
The main line was electrified as far as Traralgon, and electrification also extended to the Moe-Yallourn direct line and the Morwell Briquette Siding. The siding beyond the Morwell Briquette Factory to Hazelwood Power Station was only ever used as a construction siding for the power station, and was never electrified. The whole length of the Morwell Briquette Siding and the Hazelwood extension were always worked as sidings within Morwell yard limits. Single or double RT tractors could often be seen zipping between Morwell and the briquette works as needed.
The original Yallourn line left the main line at 'old' Hernes Oak, and was not electrified. 'Old' Hernes Oak was bypassed when the main line was deviated in (from memory) 1963, to allow for expansion of the Yallourn open cut. 'New' Hernes Oak is the crossing loop on the deviation.
The ICR was always owned and operated by the SEC, and was the last remnant of a once-extensive network of 900 mm gauge lines which served the Yallourn open cut as well as extending to Morwell (but not into the open cut at Morwell).
The Mirboo North line branched off at the up end of Morwell, and crossed over the ICR at the edge of town.
The Maryvale Paper Mill line in the 1960s was owned and operated by APM, using their own locomotives to transfer wagons between the mill and the exchange sidings. On the VR, these sidings were an Intermediate Electric Staff post. This meant that trains could be 'locked away' in the sidings to allow other trains to run through. This happened almost every weekday afternoon when the up goods was being marshalled at the exchange sidings and the up 'Gippslander' and the following all-stations pass ran through.