According to JR East, because of the affect of checking the sign at Kawasaki Station
▽The Tokaido Line runs between Tokyo Station and Atami Station.
▽ Keihin-Tohoku Line between Omiya Station and Ofuna Station
▽The Nambu Line is on the higher and decrease strains between Kawasaki Station and Tachikawa Station, respectively.
Source
JR Tokaido Line Keihin Tohoku Line Part of Nambu Line Operation Suspended | NHK
