About the next community challenges why dont add as rewards the game locomotives with special livery and patch instead the wallpapers? For example a lot of real locomotives when hit a new speed record are fixed with a commemorative unique livery and patched with the challenge done! With a bit of fantasy you can create unique challenge liveries for every next challenge! So, like already happen for Class 66 in GWE, before starting a Service we will can choice if using a classic or a rewarded livery of the Service locomotive. It's only an idea but I think will be cool. Like for example this (obviously with a patch that recall the challenge theme: 4.000.000 miles with a earth stylized logo):
I wonder how many of those liveries will be for the Taurus. I mean it's the most repainted locomotive ever.