congokid wrote:

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.

Open is the default setting on the Thai railways, at least on
non-aircon stock...

Neil