Speed limit sign only applicable to
Victorian G and South Australian BL locomotives due to their weight. This is near a bridge at Darnum, Vic.
To my knowledge, no BL class locomotive has ever made it to the Gippsland line.

My ex-Longwarry VR semaphore
demonstrating the off and on (stop and proceed) positions.
I spent many of my teenage years hanging around this signal as I lived right near it.
It cost me the extravagant sum of $15 in 1988..

VR searchlight signal gantry.
Note the different length visors. The long ones are the important ones. The short ones generally have fixed colours (red).
Explanations of this will appear later. Quite a bit later I expect.
Nar Nar Goon, Vic.

Victorian Railways sign marking the
location of signal cables.

Stratford, Vic.

This is the classic Victorian Railways (VR) somersault semaphore signal. The arm pivoted near the centre rather than the end.
The disc below it for shunting movements
rotated horizontally.
Morwell, Vic.

VR searchlight signal on an exit from the Melbourne underground loop. Searchlights have a moving    coloured vane in front of the lamp but behind the lens. They are gradually being replaced by signals with no moving parts.
Spencer St, Melbourne, Vic.

VR colour lights.
Dandenong, Vic.

The equally standard
Trespasses
Prosecuted
Sign.
Traralgon, Vic.

State Electricity Commission Victoria 900mm gauge line point indicator. Due to the fact that SECV trains tended to operate with the engines propelling the trains in one direction, indicators such as these were placed at points (turnouts / switches) so that train drivers could tell which way the other end of their train was about to go.  The centre yellow aspect was always lit. A green aspect lit to one side or the other to indicate the direction the points were set.
Yallourn, Vic.

65 km/h speed board. These are to remind train drivers of the speed limit for a curve. In most cases by the time a driver can see them, it would be too late to slow down if he was going too fast. So knowledge of the line is very important. This one is at Stratford and like a few here, they have the yellow km/h sign simply screwed over the top of the old wooden MPH signs (with the cast iron numbers removed first however).
This one is for a curve that has another sign on it warning that trains must not exceed 50km/h to the next level crossing. So having a 65km/h limit is somewhat superfluous here.

You'll really need to click on the picture here to see this signal. Yellow over green (reduce to medium speed)
indication at the entrance to Melbourne's underground 'City Loop' from the former Princes Bridge'station.
This entrance was for the City Circle service that simply ran around the loop continuously (as indicated by the sign at the top of the tunnel. Note 40km/h curve speed board at lower left. The signals in the loop are multi lens colour lights. Being in perpetual darkness, they have no visors.

Branxton, NSW. Unlike Victoria with its Green over Red aspect indicating clear normal speed. In NSW they have Green over Green, which, when you stop and think about it. Makes much more sense.
I wonder how train drivers were supposed to see these signals when the platform was full of intending passengers? Not that I imagine that happens too often these days. In any case, these signals have since been replaced.

VR shunting signal with Ultra Violet (?) stop aspect.
As with all UV lights. It is difficult to capture these
accurately on film - or on your pc monitor. One wonders if train drivers got a tan when waiting at these
signals for too long. :)
Yarragon, Vic.

VR home and distant signal
When distant signals were mounted on the same post as a home signal they had red and white arms with a fishtailed end. On their own they had a yellow and black fishtailed arm.
North Geelong, Vic.

Switchstand.  These weren't terribly common in Victoria apparently, but here is a picture of a short one that once indicated which direction the points were set at Moe, Vic.
It showed a lunar white light (lens appears blue) and 2 white circles when the points were set for the main line or a yellow light and yellow chevron (arrow) shaped arm if set for the diverging route.
Roy McDuff transparancy - Darren Hodges collection.

Semaphore and disc signals at Perth, WA.
(1980's).
Roy McDuff transparancy - Darren Hodges collection.