 This line forms part of the proposed which was never completed.The Tobu Nishi-Ita line was intended to link the Tobu Skytree Line and Tobu Tojo Line to allow efficient transfer of rolling stock, and improve the service for residents along the line.The line opened on December 20, 1931, as the Tobu Nishi-Ita Line from Nishiarai to Daishimae, with a total distance of 1.1 km.