Earlier quoted context omitted.
Having spent the past ~10 years living in London, I disagree. Rush hour Tokyo trains were a dream, people are polite and queue, but they queue so that they're not in the way, the carriages are surprisingly head-roomy for 6'4 me, unlike the shit show of the central line, they're cooled properly, like the circle/district and the stations were almost universally clean and spacious unlike our tube platforms which are oft…
Wait, wait- Any rule you can spell in a few words or a link?
DO ask people for directions or for help, people may look tired, they may look grumpy they may even be those things, but most will be more than willing to help you.
EDIT: Others covered a few important ones I missed too; backpacks off, walking N-abreast so as to be blocking others from passing are a big no-no; you may be having a leisurely stroll, commuters have places to be, whether at work or at home with their families and their feet up after a long day.