In article , Paul Terry
writes

But in those days much of the rolling stock was better designed for a
through-flow of air, with relatively large "hopper" windows and, in a
number of cases, open (but gated) platforms at the ends of carriages.

I may be mistaken but in January 1989 in Sydney I'm sure that the
passenger doors were kept open - presumably for ventilation purposes -
between stations on at least some of the older trains on the Cityrail
system. This year the trains I travelled on there appeared to be newer
and had air conditioning.

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