It is a subsidiary of the mobility company Flix SE [de], which also owns long-distance coach operator FlixBus and is supplementing the bus network with rail connections.

[4] Also during 2017, FlixTrain formed a partnership with the Czech-based open-access operator Leo Express to collaborate on services along the Stuttgart - Berlin route.

[6] In December 2020, FlixTrain submitted a formal complaint to the European Commission regarding €5 billion in state aid provided by the German government to Deutsche Bahn, alleging improper procedure and the creation of anti-competitive conditions.

[7] By mid-2022, FlixTrain had expanded its network in Germany to cover 70 domestic destinations, had also launched services in Sweden - which ceased in 2024 -, and was offering one line terminating at the Swiss-German border station of Basel Badischer Bahnhof.

[11] While operations resumed on 23 July, the company again suspended all its services during October 2020 at the start of the pandemic's second wave; it was decided during the suspension to overhaul FlixTrain's rolling stock.

[11] This move came in spite of a general downturn in passenger traffic as a consequence of the pandemic; it was speculated that this expansion had been encouraged, at least in part, by the German government’s announced removal of track access fees for 2020 and 2021.

Perhaps the most high-profile part of this announcement was the pending launch of FlixTrain’s first cross-border service, running between Berlin and the Swiss city of Basel; operations began on 23 June 2022.

[17] However, in April FlixTrain announced that it would pause services in Sweden completely and move the carriages to Germany to supply the increased demand there.

[2] During the late 2010s, plans for expanding into the French market were reportedly set in motion, with an anticipated launch date for services during either 2020 or 2021; these ambitions were indefinitely postponed in April 2020.

[21] In 2023, FlixTrain applied to run international services between Germany and the Dutch cities of Arnhem, Utrecht, Amsterdam and The Hague to Rotterdam.