Don't push me cause I'm close to the edge
Tokyo Damage Report's article on bad walkers already covers the basics of Japanese behaviour in crowded places (shops, trains, on the street). I've been trying to observe it carefully in order to work with it, since it's extremely annoying at first.
日本人の込んでいる所での歩き方について「Tokyo Damage Report」の「bad walkers」という記事の中に書いてある。その歩き方が初めにとても難しいので、日本人といっしょによく歩けるため、調査して来た。
In the UK, the normal behaviour in a crowded place is to pay lots of attention to the people around you, without actually making eye contact or talking to them (except perhaps to say "sorry" or "excuse me"). Even when walking down the street one is expected to pay attention and move out of the way if someone is trying to get past or coming towards you. People who don't conform get frowned at, or, even worse, tutted at. ("Oblivious" is one of my mum's worst insults.) Actual physical contact is strenuously avoided.
イギリス人は大体込んでいる所で、「sorry」か「excuse me」しか話さないで、目を見ないで、近い人によく気が付く。道を歩くときも、前から来る人とか通り越す人とか避けなければならない。[OK, I'm making a hash of this so I'm giving up for now.]
In Tokyo, the normal behaviour is to ignore everyone as if they're not there. Since this can't actually work, people do actually shuffle slightly out of one another's way if a collision is imminent, but there's certainly no obligation to pay attention to people trying to get past you, for example. The normal etiquette for getting past someone is simply to push them gently (or not so gently if on a crowded train). Again, one doesn't make eye contact or say anything.
I haven't experimented much with pushing, but I'll let you know what happens.