Thanks! The next update will include a new mode (or scenario) called rescue, where the train has broken down and you need to bring it back to the depot. This mode will be automatically available for most services. Instead of manually creating these kind of scenarios, I'd prefer to generate them automatically for all services in the timetable.
In addition, of course, it would be nice to enable users to create their own timetables and scenarios. The third update is planned to have a simple route and timetable editor, and I'll try to design it in a way that it's easy to learn and use.
In your last sentence do you mean that you would prefer to use screenshots from the sim as background images in the user interface, instead of photos?