The subway superhero
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Subway superhero helps citizens of Tokyo

22 August 2013 Last updated at 20:56 BST

Tokyo's metro system is the busiest in the world, and notoriously difficult to navigate.

If you have heavy luggage or a pushchair, the lack of escalators or elevators makes matters even worse.

This is complicated by the fact that Japanese culture makes it difficult to accept a favour from a stranger.

Now one resident is taking matters into his own hands, with the help of a $40 superhero costume.

Jonathan Josephs reports.