The section of the route from Rinteln to Hildesheim lies in the state of Lower Saxony.

In 2002, the tender for the operation of Regionalbahn service RB 77 for eight years was publicly advertised; this was let to Eurobahn, a subsidiary of the Keolis group (Keolis Deutschland GmbH & Co. KG, Berlin), based in Bielefeld.

In November 2020, Regionalverkehre Start Deutschland announced that it will operate the service from December 2021 on.

[3] It is operated using two-part Alstom Coradia LINT diesel railcars, which are owned by Landesnahverkehrsgesellschaft Niedersachsen mbH (Lower Saxony state transport company, LNVG).

In operations, the trains on the Weser-Bahn service continue through Hildesheim towards the Lamme Valley Railway to Bodenburg.