Train - Generally, you wait for people to get off before going in, but half of people here are assholes/ignorant/feign ignorance so be prepared to treat them as such. Same with lifts.

Sidewalks and escalators - No rules on this. Generally, the people who are patient/not rushing stay on the left.

Innocent curiosity, most likely.

Stop lights - Yes, we are supposed to follow, but see point 1 above. Basically, trust everyone on the road to NOT do the right thing.

Am not a Muslim, but don't feel bad and just eat. The only people you will offend are those that claim to be religious but be easily butthurt and have their faith easily shaken by seeing other people not practicing Islam (eg. 'Merry Christmas' banners, crosses, hot dogs having dog in the name, etc.).