Hi!
I'm travelling from Budapest to Prague and I've found a Regiojet train that meets my terms of travel but I'm wondering if I can even use the Regiojet train because I don't know if it's one of the train operators usable for Interrail travellers.
Any information will be welcome. Thanks
Yeah Regiojet can be used with Interrail :)
but as the Route is quite cheap price arround 20€you may save a travelday of a flexipass 
and used the saved day for a nice daytrip or a new destination
Here the Interrail fares for Regiojet https://www.regiojet.com/prices-and-tickets/interrail/
The price in low cost is just 16€ for that route 
(without Interrail)
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