Version 1.11 is the iOS 27 release. The short version:

A new app icon

The icon is now a proper layered icon. On iOS 26 and 27 that means it gets Light, Dark, Tinted and Clear versions from the system, with real depth to the three trains. On older versions of iOS, and on the Apple Watch, it’s the same design rendered flat and noticeably sharper - the three trains no longer merge into one shape at small sizes. As a side effect the app is about 1.3 MB smaller. The same logo now appears inside the app too, on the welcome and empty screens and at the top of a new About section in Settings.