Seth's train is Ash's favorite spot to be-- not just because of Seth either (although admittedly he's reason enough.) Ash feels safe in Seth's train car because it's metal and the fey can't follower her inside.
Portions of the outside of the train are decorated in the murals that run the gamut from anime to abstract. On the far side of the train are Seth's metal-work sculptures. Between those sculptures and in some cases twining around them are plants and shrubs Seth tends and cultivates.