From Railcolor Operator News; March 9, 2018
Last year FlixMobility, mother company of Flixbus, flirted with railway operation for the first time. It decided to take over Locomore’s Stuttgart – Berlin train services (together with LeoExpress from the Czech Republic) after this company ran out of money. 
Now we can say this has been a ‘test case’ to FlexMobility to experience whether or not railway operation is profitable for FlixMobility and if trains complement the company’s bus network in Germany. It does, which we conclude from these new plans:
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