WestfalenBahn is a railway company operating regional train service in Lower Saxony and North Rhine-Westphalia, Northern Germany. It was founded in 2005 by Essener Versorgungs & Verkehrsgesellschaft, Minden Museum Railway, moBiel and Verkehrsbetriebe Extertal, each having a 25% share. In 2008 Essener Versorgungs & Verkehrsgesellschaft's share was sold to Abellio Deutschland. In July 2017 Abellio bought out the other shareholders.

Abellio Deutschland is a public transit operator in Germany operating bus and rail networks. Headquartered in Berlin, it is a subsidiary of the Dutch state-owned Abellio.