Train colors should match your color palatte—currently, they’re red, blue, green, and white no matter what color palatte you’re using.
Same for forms, it would be great to mix some shapes with colors, exactly like we can do with location points: trains with “cmcmcmcm:cmcmcmcm:cmcmcmcm:cmcmcmcm:cmcmcmcm:cmcmcmcm” would be awesome!