The challenge lies in taking pictures of the selected subway stations without any people around. That is usually only possible on a Sunday between 5 am and 7:30 am, because there is practically no ... more 
The challenge lies in taking pictures of the selected subway stations without any people around. That is usually only possible on a Sunday between 5 am and 7:30 am, because there is practically no commuter traffic, and most people are still in bed. So there is just a very limited time frame to create pictures full of atmosphere, which reflect the character of a city in a wonderful way – around the world! less 
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Yahoo Finance India
Thu, Dec 27, 2012 8:00 AM AST (Arabian)