The table illustrates lines, total length, annual journeys, and cost of single ticket of underground systes in six cities (New York City Subway, Londin Tube, Tokyo Subway, Paris Metro, Mexico City Metro, and Beijing Subway). Units for total lenght, annual journey, and cost of single ticket are measured in miles, billions, and UD dollars respectively.
Overall, New York city subway has the highest number of lines and total length, while the majority of annual journeys account for Beijing subway. The most expensive ticket cost is for London Tube though its total length is one third from New York City Subway. Cheapest ticket price can be seen in Mexico city, eventhough Paris Metro has the lowest total length.
In terms of New York City Subway, there are 24 lines, while Mexico city has half of New York subway (12 lines). Rather than New York City subway, all other cities have less than 20 lines. Furthermore, Paris metro has low total length of 127 miles, where New York city has 659 miles making it 6 times higher than of Paris.
Mexico City and Beijing subways have low ticket cost ($0.23 and $0.45), whereas London Tube ticket which is the most expensive is 7 times higher ($7.30). Paris Metro has the half of the annual journeys compared to Tokyo Subway.