Remove your backpack when entering a crowded train or elevator, always make sure that all flaps are secure
Do not flash money or jewelry in public places
If
you carry a wallet, never carry it in your back pocket. Front pants and
breast pockets are much more difficult for the pickpocket.
Be suspicious of anyone approaching you and trying to distract you. Pickpockets usually work in teams.
When traveling on the subway during off-hours, ride in the cars with the conductor
When waiting for a train late at night stand by the token booth or in the area designed as off-hours waiting area.
Remember
that no property is worth getting seriously injured over. If you find
yourself a victim of a crime, remain calm, try and get a good
description of the person committing the crime and call the police
immediately.