(http://imgs.xkcd.com/comics/train.png)
http://xkcd.com/1366/
I do the same with my feet 8)
That's exactly the reason why when you put two trains on the same track facing each other, neither of them can move, provided that both are equally strong. ;D
Jokes apart, when I was younger I used to imagine that, when walking, I was just moving the whole Earth with the immense power of my legs...
Edit: @gauthier: now I see that I wasn't alone, thinking like that...
And, when you take train, in fact it's me moving the Earth under your train ;)
[r7218] Convoys move over ways, instead of ways moving under convoys.
The physics engine needs a serious overhaul before you release the RC, this bug has existed since at least the 100.0 series. Please fix immediately.
:D