The table compare six underground railway systems by the factors, such as cities, data opens, kilometres of routes and passengers per years.
Overall, as it can be clearly seen from the given table that over the years amount of people are decreased. The most popular underground railway system was in Tokyo that achieved 1927 passangers per year.
The first underground railway system was opened in London in 1863. So, this railway system achieved the highest kilometres of route. But, the next 27 year Paris also opened their railway system, and the lenght of route was smaller than London. However, Paris system was popular around passengers. And in 1927 opened the most popular underground railway system in Tokyo. Tokyo’s location was smaller than others, as a result the killometer of route smaller. But, Tokyo achieved the highest number of passengers.
The next railway system opened in Washington (1976). The killometer of path was two times less than the first railway system. The number of passengers decreased by the next railway system in others cities. The smaller and not popular was in Los Angeles, that achieved only 50 million passangers and was as short path as others.