All of which leads to another point of interest (swinging back to trams).

Yes, buses typically use the so-called passenger flow method (with defined entries and exits) in Australia and NZ - not very well mostly as the first door is also typically used for exit. It wasn't always thus. Sydney used all-door passenger exchange on all modes from the beginning to the 1970s when the phasing out of conductors on buses was completed. Meanwhile Europe headed back to the original Sydney method as Sydney moved away from it.

All-door exchange is slowly returning to buses in Australia with the advent of smart card fare systems and is now to be found on services such as the CATs and special events in Perth, the CityGliders in Brisbane and, iirc, Ryan's Bus in Melbourne. There may be other examples. In NSW TfNSW is still dead set against it.

Trams have always tended to be all-door exchange in Australia but there was one famous example of experimenting with passenger flow in Melbourne with, as I recall, the arrival of the Zs. I'd be interested to know during which years this experiment prevailed, whether it was for all trams (apart from the Ws I presume) and when and why Melbourne trams reverted to all-door exchange. (I mean I can guess why, but good the hear these things from the horses mouth so to speak!)

It would also be interesting to know if any other Australian tramways used the passenger flow method.

Tony P