Adding to the tangent discussion about reserve track sections, the Glenelg line was not the only example of reserve track in Adelaide (although certainly the most notable example).
Other examples on the old system in Adelaide include:Col Light Gardens line:
King William Road to Goodwood Road and along Goodwood Road on the final stretch of the line to the terminus in Col Light Gardens.
The first stretch of reserve track was known as Fowlhouse Alley and ran parallel to the Glenelg line, creating the unique spectacle of four tram tracks in the same alignment.Hyde Park line:
The Hyde Park line included a reserve track section running on a reverse curve through Heywood Park. This section of line was also fenced off.Kensington Gardens line:
After leaving Grenfell Street in the CBD, the line passed through the eastern parklands on an embankment running through to Kent Town. The embankment is still visible in Rymill Park today.Cheltenham line:
A very short reserve track section existed between Hill Street in North Adelaide and Hawker Street in Brompton.Morialta line:
This is something of an unusual case in that the track on this branch line was laid to the side of the road and not in the middle.
There are a couple of other very small examples but these are the main ones I could think of.