I'm not sure if this is a bug, or if they just forgot to add it. The new Czech route doesn't have a mastery.
Unfortunately, the mastery rewards weren't ready for launch, but they will be coming early next week. However, the challenges are live now, so you can start making progress on them, but you won't be able to unlock the rewards just yet.
Interesting that the moment the lack of Mastery rewards is reported, this generates an immediate response from a staff member. But after several players point out the missing Raildriver/Hardware support, there is just silence from the team., even though a bunch of us are deciding either to not buy the route or to refund. There may not be many of us, but a lost sale is a lost sale.
