Coming up now against several routes and trains with Journey modes which have broken scenarios etc. preventing that one from being completed. So the question is, for those routes where the individual Journey elements can be accessed from a list, if I skip forward to the next one(s), if or when the broken scenarios are fixed and I go back to play it, will "Journey" force me to replay the ones after that I've already finished or skip to the next uncompleted element? (Or if that was the only outstanding Journey, give me whatever completion accolade is generated).
If you skip a journey item and then come back to it later on, I believe the journey should proceed to the next unticked item afterwards. The game can tell what's complete and what isn't. When you fully complete a route's journey mode (including any DLC journeys) and then go back and play an item on the list, the "continue journey mode" button at the end of the service mode won't have a service named and selecting the option does nothing instead of giving you the option to play journey mode in order again.