Camelbacks weren't the only locomotives with two firebox doors! I have a Precision Scale model of a New York Central F12 4-6-0 (the type that worked on the Putnam Division), which was clearly a bituminous burning engine......with two firebox doors! Since these engines were built in 1905 and the firebox spread over the rear drivers, suspect that the view at the time was that such a "huge" firebox must need two doors to get coal properly dispersed! Canadian Pacific's small D4g 4-6-0's had the traditional firebox between the drivers and firing them was referred to throwing coal "down a bowling alley"!
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