An 88%-strength solution of ammonium nitrate in water.
Solutions of this strength are obtained direct from ammonium nitrate factories and must be kept at over 90 degrees C to prevent solidification and are used in the manufacture of liquid emulsion explosives.
To model the production in Trainz, you can assume that every 1000kg of emulsion will require 900kg of the 88%-strength ammonium nitrate solution, 50kg of extra water and 50kg of an oil such as diesel. Transportation in rail and road tankers is possible, and they are normally heat- insulated. The solution is a class 5.1 oxidizing agent.