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 monthSBB'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.