I wrote this earlier after I did that thing where you're sitting on a train in a station, alongside another train, and then the other one starts to move away, and then you realise to your terror that everything else except your train is also moving. And then finally you realise that it's actually your train that's moving. And you feel like a bit of a wally.
The passing trains don't
Know who's on which one, or which
Way they're both heading