An SBB spokesperson tells CNET that the amount of the licensing fee and other agreement details will remain confidential.
We've reached out to Apple and will update if we get a comment or any more information.
Apple last month was accused of ripping off SBB's iconic clock for the latest iteration of its mobile operating system. The clock was created in 1944 by then-SBB employee Hans Hilfiker. It's used throughout the railway system and is also licensed to Mondaine, a Swiss watch maker.