It is a joint venture of Stadtwerke Osnabrück AG, Verkehr und Wasser GmbH in Oldenburg and Transdev Germany, Berlin.

[5] In March 2008, NordWestBahn won the tender to operate the regional S-Bahn services in Bremen and Lower Saxony, having submitted a more favourable bid than the incumbent operator DB Regio; the contract awarded was reportedly worth roughly 500 million euros.

[2] Valued in excess of €1.5 billion, this was an important milestone for the company, being the single largest regional railways contract in its history, pertaining to the operation of the entire 385-kilometre-long (239 mi) network around Hannover for a duration of 12 and a half years, starting in December 2021.

[10] To fulfil this demand, the company took on additional rolling stock in the form of Stadler FLIRT electric multiple units (EMUs).

[1] Later that same year, NordWestBahn agreed terms with the rolling stock leasor Alpha Trains for the latter to acquire 16 Stadler FLIRT EMUs for their use by the former around Bremen; the new fleet was introduced during late 2022.