App Privacy: Why does the railroad company need my steps made and other health data? How-To revoke?
This is required for the EasyRide functionality. The first time you activate it within the app you are asked to grant access by iOS.

(EasyRide wants to access your Fitness data to optimally support you, e.g. if you forget to sign-off after a trip)
If you decline you can't use the EasyRide functionality

You can check in System Preferences -&gt; Health whether the SBB app has access to its data or not. Access can also be revoked from there.