Tolong jelaskan mengenai Jalur Utama Nagasaki dalam bahasa sunda

, atawa Jalur Nagasaki, manjang ti Tosu Station di Saga Prefecture nepi ka Nagasaki Station di Nagasaki Prefecture, Jepang. There is a separate branch of this line which runs from Kikitsu to Urakami by way of Nagayo. There are currently plans for the western (Nagasaki) branch of the Kyushu Shinkansen to run from Hizen-Yamaguchi to Isahaya, parallel to the existing track.