At the moment on Ebay, there is a vintage QGR ticket between two stations Forest Hill and Rosewood; https://www.ebay.com.au/itm/184896301996?ul_noapp=true . These two localities are located on the western line between Ipswich and Gatton. Now the curious thing is that there two stations on the old NSWGR called Forest Hill and Rosewood, and they are also on the same line as each other, the Tumbarumba Branch.
Now I know that it is not uncommon for suburbs or towns to have a twin in another state (I think every State in Australia has a "Richmond"). It is much less common for those states to have Railway Stations with another of the same name in another state, but there are several examples. But I cannot think of any (other) example where two locations that are on the same line, and potentially served by a single train, have a twin pair in another State that are also on the same line and served by one train. Can anyone think of any others?
Having said this, someone will now tell me that there was a requirement in the Federal Constitution for each State to have two stations called Forest Hill and Rosewood, and they must be served by one rail service!