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World's best megacities for public transport

SEOUL, SOUTH KOREA - MARCH 4: Pedestrians are seen at the subway station on March 4, 2006 in Seoul, South Korea. Seoul has a population of 10,297,004 as of the end of 2005. This accounts for about a quarter of the total national population. The number of foreign residents in Seoul as of the end of 2005 is 129,660 or about 1.3 % of Seoul's total population. They include 77,881 Chinese, 11,487 Americans, and 6,710 Japanese. There are people of more than 90 different nationalities currently residing in Seoul, forming a small global village. (Photo by Chung Sung-Jun/Getty Images)

Top megacities with the best public transport

Mumbai has the sixth-worst rail service in the world compared to the globe's major cities, according to a report by PricewaterhouseCoopers.

Twenty-seven of the world's largest and most influential cities were measured on economic factors, quality of life, technology and cost of doing business, in the study which was released last week.