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In a lot of cases from personal experience, it's literally an invitation.
Was heading home from my old town of Armadale, on the train up to Perth. For a while, the train was empty except for us two. She looked around, noticed only me, I finished reading the newspaper (Fear-mongering bullshit, but I like seeing the occasional used car), walked over, and simply asked if she wanted to get a drink later, to which she responded she wanted more than that, stood up, we started making out, then we fucked. Since then, I've been starting to (needlessly) catch the night trains more and more.
Transperth admins probably had a wank over the footage, but oh well, good for them.
Rest of the time, it's either she ignores the other person, or accepts the bar offer, we hook up later, we fuck, and then she tells me about her boyfriend, so I leave her.