In New York, Grand Central Terminal sees more than one million people per week use its platforms and cross its art deco terminus. Penn Station, on the west side of Manhattan, is the busiest terminal in the western hemisphere.
A million daily passengers and no ticket barriers makes spotting fair evaders difficult in Calcutta. Meanwhile a hundred street kids live right on the platforms.
Melbourne's iconic Flinders Street station is not just the busiest and oldest in Australia, but in the whole of the southern hemisphere. It was opened in 1854 and today, 30 million passengers per year makes use of its 15 platforms.