御堂筋線
The Tanimachi Line has the longest operating distance (for the purpose of fare calculation) in the Osaka subway network, after the Midōsuji Line (although the latter would be the longest in the Osaka subway network if the Kita-Osaka Kyūkō Railway section of the Midōsuji Line was taken into account). It runs completely underground from Dainichi to just before Yaominami, and was known as the longest continuously underground subway line in Japan for a long time after the opening of Yaominami Station (it was also among the longest subway tunnels in the world at the time of its opening). Now, it is fourth in Japan after the Toei Ōedo Line (entire line, ), Saitama Rapid Railway Line/Tokyo Metro Namboku Line/Tōkyū Meguro Line ( – via and , ), and Nagoya Municipal Subway Meijō Line/Meikō Line (entire line, ).