Formed with the restructuration of the Teito Rapid Transit Authority, Tokyo Metro innherited it’s predecessor’s 8 lines, and opened a ninth one – the Fukutoshin Line – in 2008.
It’s network is 195 Km long and has a daily ridership of about eight milions. Seven of it’s lines have trough-services with private railways or JR lines.
Teito Rapid Transit Authority
Formerly the main subway company of Tokyo, it was administrated by the Ministry of Transport. It ran 8 lines between it’s formation in 1941 and it’s restructuration in 2004.
TRTA is notable for having pioneered the regular usage of several new technologies, such as the current chopper traction control, in-cab ATC signalling and many more.
Osaka Municipal Subway
Operated the Osaka Municipal Subway from it’s opening in 1935 to 2018, when the subway operations were transferred to the private “Osaka Metro” company.
It’s network is 130 Km long and it’s composed by eight subway lines and an AGT line (the “Newtram”) with a combined rideship of three milions.