Regionalverkehr Alb-Bodensee
Regionalverkehr Alb-Bodensee, formerly DB ZugBus Regionalverkehr Alb-Bodensee, is a transport company that operates bus services in the German state of Baden-Württemberg. It is a wholly owned subsidiary of DB Regio, itself a subsidiary of Deutsche Bahn. History 
Prior to the December 2021 timetable the company, under the name DB ZugBus Regionalverkehr Alb-Bodensee, operated various regional rail services in Baden-Württemberg in addition to bus services. DB Regio restructured the company, with the rail services transferred to DB Regio Baden-Württemberg. References

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Public bus companies of Germany
Deutsche Bahn