In virtually every case, young people only think of the destination as quickly as possible and cannot comprehend that the journey is sometimes even better than the destination, so they don't really factor into the traveller demographic.When an argument depends on the customer being wrong, it's probably a good time to retire it.
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The tired old XPT, combined with cheap airfares has killed off interstate bus travel between Melbourne & Sydney and the same could occur between Melbourne and Adelaide, provided a timely daily rail service is implemented. There are MORE pax travelling the full journey between Melbourne and Sydney than most 'pagers realise.
Out of curiosity, what is the joy of the journey in the Overland? It's nice as it goes through the Adelaide hills, and there's a brief bit of excitement at Murray Bridge, but otherwise?
Have a read...
https://www.adelaidenow.com.au/news/opinion/michael-mcguire-there-was-no-particular-reason-we-had-to-be-in-melbourne-it-wasnt-the-destination-but-the-journey/news-story/172846f95c0172ba6f4d864df72c8602