The recent update 5.1.3 of RailModeller Pro features a new option to automatically convert manually bent flex tracks in the layout to straight or curved flex tracks with editable length or radius. The new "Move to layer" contextual menu command provides a quick way to move individual elements to a different layer directly from the layout area.
A number of additional improvements to the app's user interface allow quick access to previously used settings in a number of dialogs across the app.
RailModeller Pro 5.1.3 is available on the Mac App Store.
Installed apps will be updated automatically by the built-in Software Update feature of OS X.