Some ETS steam locos, like the Garratts they make and 2-8-0s, can be equipped with smoke at the factory. However the closest thing I can see on their current product list, a 0-4-0 numbered 126, does not have that option. Looking at the size of it, I can see why although there might be room for a Seuthe unit, but I don’t think those can use conventional 3-rail smoke fluids.