Sōtetsu focuses on railway operations, although formerly it had a more diversified set of holdings, such as bus lines and supermarkets.

As of 1 April 2016[update], Sōtetsu operates the following electric multiple unit (EMU) train types.

[3] Further 20000 series trains will be delivered ahead of the start of inter-running services to and from Tokyu Corporation lines scheduled to commence in late fiscal 2022.

[7] The Jinchū Railway (神中鉄道) was established in Seya village (now, Seya-ku, Yokohama) in 1917 and opened its first section from Futamata-gawa to Atsugi in May 1926.

[11] At the same time, Imperial Japanese Navy Atsugi Airport was opened, so the ridership and freight traffic increased sharply.

[15] In 1952, Sagami Railway purchased the 25,000 m2 of land around Yokohama Station's west entrance from Esso, and began to develop to attract department stores.

This project created a 12.7-kilometre (7.9 mi) railroad which allows residents and commuters alongside the Sōtetsu railway lines to better access the Tokyo Metropolis as well as Tokaido Shinkansen by interchanging at Shin-yokohama.