schoolgirls on an original russet color Sydney electric multple unit

There was no airconditioning on these so doors were kept open on hot summer days for cooling.  You can imagine how Safety and Health would react to that today -- hermetic sealing is required!

No date but likely early 1990s and seen between Wollstoncraft and Waverton. For lots more, see the book Railway Electrification in Australia and New Zealand.