WebDouble-track. Track gauge. 1,067 mm ( 3 ft 6 in) Electrification. 1,500 V DC ( overhead catenary) Operating speed. 90 km/h (55 mph) Route map. The Keihin–Tōhoku Line ( Japanese: 京浜東北線, Hepburn: Keihin-tōhoku-sen) is a railway line in Japan which connects the cities of Saitama, Kawaguchi, Tokyo, Kawasaki, and Yokohama.