Train Kiln

Deriving its name from the appearence of a steam locomotive due to the positioning of the firebox and the chimney at opposite ends of the ware chamber, a train kiln is a Bourry-box type kiln.  

 The Bourry box is a type of wood-kiln firebox where primary air enters from the top of the firebox, passes down through the wood, and combustion occurs at grate level, thus is supercharged by the heat of the coal bed. Heat and flames enter the firing chamber below grate-level. In a true Bourry-box, wood can be piled above the grates and becomes gravity-fed down to the combustion zone.