This is a bit hard to parse, but it's worth noting that Switzerland does have great trains. Often described as the best national network in the world. In this incredibly mountainous country, where almost every line involves multiple tunnels and bridges and viaducts, you can get to all but the smallest of towns by train.
Perth isn't in South Australia, but AFAIK Adelaide doesn't have an underground train line either. Australia doesn't really have 'subway' systems, just a few underground stations around the inner city, at most.