The table compares underground railways systems in six different cities including when network is opened, length of services, and passenger number. At first glance, it is evident that the oldest underground networks such in London, Paris, and Tokyo was larger and had a higher number of passengers than others such in Washington DC, Kyoto and Los Angeles.
Turning first to the Oldest network, the first largest system was in London. It was opened in 1863, with 394 kilometers of route and 775 million passengers per year. The second largest networks, in Paris, is only roughly a half the size of London underground and served 1191 passengers. The Tokyo systems was the highest passenger number, with 1927 passengers.
In contrast to this, the remaining 3 countries, Washington DC was the most extensive than the other networks in route, with 126 kilometers. That network served 144 million passengers per year. Next, the other networks were Kyoto and Los Angeles. They had a lower passenger than Washington DC with 45 million and 50 million respectively and had about a fifth of the route size of Washington DC.