I know this thread is probably too early, but better sooner than later I guess. At the moment, we can set Sodor to different times of the year and different weather like rain or snow. I'd like decoration options like seasonal ones for example. Choose to deck out a snowy Sodor around the Christmas season or couple Halloween décor with a foggy night service run. Not just seasonal too, could be anything that fits Sodor and adds a nice variety.
I like that idea a lot actually! They can already do seasonal differences in some ways so it would be very cool to see that!