Apply fire cycle colours to existing wagons
The existing hopper- and open wagons also need the fire cycle colours applied, to have multiple cargo support.
See Voyager One's gen0 wagons for examples.
Also at the same time put these wagons in the template. Empty template that can be used can be found in the /gfx/steam dir. It's called a steamer template, but that's only due to the amount of premade blue boxes.