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How about having a thread where you can upload scenarios for routes that you have changed, which you think people will like to try. Maybe a different train or weather conditions.
This seems to be a good idea, it could feature in something coming up soon on RailUK. If anyone ideas about it could PM me and I may be able to contact the relevant route authors regarding it.
Afterall, saves authors a job! However, I would recommended a strict testing panel, who could test the routes before they are publicly unveiled simply because we don't really want any routefiles with dodgy timings, or with errors...