 In 1931, the lines were purchased by the Tobu Railway Co. which closed all bar the Tateiwa branch, which it converted to gauge and built a connection to Nishi-Kawada station on the Tobu Utsunomiya Line.The Tateiwa branch ceased operation in 1961 following a landslide and was formally closed in 1964.The Nikko Electric Railway Co. opened an 8 km line electrified at 600 V DC to Iwanohana between 1907 and 1913, and extended it 2 km to Umakae (approximately 300 m higher than Nikko) in 1931 to connect to a 1.2 km funicular railway that climbed 428 m which opened in 1932.