/**
	 * Set the production multiplier of given industry. This will call a callback in NewGRFs
	 * which will return actual production based on the production multiplier specified from
	 * your game script.
	 * @param industry_id The index of the industry.
	 * @param prod_multiplier The new production multiplier
	 * @pre IsValidIndustry(industry_id).
	 * @return The IndustryType of the industry.
	 * @api game
	 */
	static IndustryType SetIndustryBaseProduction(IndustryID industry_id, uint16 prod_multiplier);

	/**
	 * Send a message to the NewGRF. This result in random production change callback and
	 * tile animamion callback of the industry NewGRF being called. 
	 * @param industry_id The index of the industry.
	 * @param message These bits will be passed to the NewGRF var 10 resp. 18 for prodution
	 * change callback resp. animation callback.
	 * @pre IsValidIndustry(industry_id).
	 * @return The IndustryType of the industry.
	 * @api game
	 */
	static IndustryType SendIndustryMessage(IndustryID industry_id, uint16 message);