The chart below compares train infrastructures in six major cities based on their age, size, and annual capacity.
It is clear that the three oldest underground systems are larger and serve significantly more passengers than the newer systems.
The London Underground is the oldest system, having opened in 1863. It is also the largest system. with 394 kilometers of route. The second-largest system, in Paris, is only about half the size of the London underground, with 199 kilometers of route. However, it serves more people per year. While Only third in terms of size, the Tokyo system is easily the most used, with 1927 million passengers. per year.
The Washington DC underground is the largest of the three the newest groups, having 126 kilometers of track, whereas Kyoto and Los Angeles only have 11 and 28 kilometers respectively. The Los Angeles network is the newest, having opened in 2001, while the Kyoto network is the smallest and serves only 45 million passengers per year.