東武伊勢崎線とJR宇都宮線は羽田空港アクセスのため、相互直通する計画があります There is a plan to connect Tobu Isesaki Line and JR Utsunomiya Line directly to access Tokyo Haneda Airport. その際、北千住•渋谷方面へ折り返しが主な北側留置線が支障となり、撤去されるはずです At that time, north side detention line, which mainly turns back towards Kita-Senju/Shibuya, will be a hindrance and should be removed. 動画を観たら、その折り返しを館林へ、本数削減の代わり10両化なら効率良いと感じました After watching the video, I felt that it would be more efficient to do the turnaround at Tatebayashi, and instead of reducing the number of trains, make it 10 cars.