The table shows three categories data of the underground railway systems in six cities.
In generally, London has been the oldest building and the highest number of kilometers of route, while the most new was belonged to Los Angeles.
Although London's subway has been built before, the high numbers of passengers per year is Tokyo. Tokyo has had the busiest underground line contrasted with other five cities, followed by Paris, London, Washington DC, Los Angeles, and Kyoto.
On the other hand, there are two various cities like Kyoto and Los Angles in where the system has been built, difference compared to other four cities. Despite Los Angles was being more marked rather than Kyoto, both of them has had reasonable passengers
Overall, London has the older underground railway system, the most which has had a sharp rise of passengers was Paris. Then, the older is the railway system, the longer is the route of the railway system.