Erixx GmbH is a private railway company operating regional train service in Lower Saxony and Bremen, northern Germany. It is wholly owned by Osthannoversche Eisenbahnen AG (OHE). Since 11 December 2011, Erixx operates on behalf of the public transport company of Lower Saxony. The name is derived from Erica, the genus of heath plants, and "x", representing the Heidekreuz, the services it operated over the Lüneburg Heath until 2021.

The Heath Railway is a regional railway line in North Germany that crosses the Lüneburg Heath from which it derives its name. Most of the line is unelectrified and single-tracked. It links Buchholz in der Nordheide with Hanover, the capital city of Lower Saxony. Together with the east-west Uelzen–Langwedel railway, this north-south line is one of the two most important railways on the heath.