The Naniwasuji Line (なにわ筋線, Naniwasuji-sen) is the tentative name for a planned underground heavy rail line, which will run north-south through Osaka City, primarily under the avenue . It has long been pursued by West Japan Railway Company (JR West) and Nankai Railway in order to connect the Yamatoji Line (Kansai Main Line) and Nankai Main Line with Shin-Osaka Station, greatly enhancing both companies' connections to Kansai Airport and Wakayama Prefecture. As of 2017, construction is expected to begin within the next few years and last until spring 2031.