Hello,
The Airbus A400M can be equipped with a water kit and become a fire fighter. It can deliver 20 tons of water, or mainly retardant within few seconds. Successful tests were made over the recent huge wildfire nearby Bordeaux city.
The models represent two aircraft from Spain and France, as they may be in the future, standard military transports carrying a water kit.
In Trainz, the colour of the retardant may vary according to your monitor and its settings. Adjustments can be made in the config.txt.