Hey Guys, I was wondering if somebody could help me out. Walthers has many kits for the steel mill including the blast furnace, rolling mill, coke oven and quencher, electric furnace, and coke retort. My question is what is the difference between the coke oven and coke retort. They sound like they do the same thing, turn coal into coke to be used at the blast furnace and other industries according to the descriptions on Walthers. The coke retort is with the empire gas works series and the coke oven and quencher is with the steel mill series.