The rail infrastructures of this line are maintained by the Japan Railway Construction, Transport and Technology Agency (JRTT).

Sōtetsu collects the operation revenue and pays JRTT for using the rail infrastructures, then JRTT use this payment to maintain the infrastructures and reimburse the loan for the construction of this line.

The new facilities at Shin-Yokohama Station are jointly operated by Sōtetsu and Tōkyū.

[5] As of November 2022, various trainsets from Sōtetsu, Tōkyū, Tokyo Metro, Toei, and Tōbu have been conducting tests along the now completed segment of this line and the Tōkyū Shin-Yokohama Line between Hiyoshi and Hazawa Yokohama-Kokudai.

On 16 December 2022, Sōtetsu, Tōkyū, and the Japan Railway Construction, Transport and Technology Agency announced that the Sōtetsu Shin-Yokohama Line's extension to Shin-yokohama will open on 18 March 2023.